Garmin GNC 300 Pilot's Manual
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Garmin GNC 300 Pilot's Manual

Garmin GNC 300 Pilot's Manual

Garmin gnc 300 pilot's guide owner's manual & reference
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OWNER'S MANUAL
& REFERENCE
ACTV
STBY
CLR ENT
CRSR
TM
MSG
SQ
NRST
RTE
WPT
NAV
GNC 300
Pilot
'
s Guide
®

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  • Page 1 OWNER’S MANUAL & REFERENCE ACTV STBY CLR ENT CRSR NRST GNC 300 Pilot ’ s Guide ®...

  • Page 3: Foreword

    GARMIN. Information in this document is subject to change without notice. GARMIN reserves the right to change or improve their products and to make changes in the content of this material without obligation to notify any person or organization of such changes or improvements.

  • Page 4: Cautions

    Although the GARMIN GNC 300 is a precision electronic NAVigation AID (NAVAID), any NAVAID can be misused or misinterpreted and therefore, become unsafe. Use the GNC 300 at your own risk. To reduce the risk of unsafe operation, carefully review and understand all aspects of this Owner’ s Manual and thoroughly practice using the simulator mode prior to actual use.
  • Page 5 Accessories & Packing List Congratulations on choosing the finest, most full-featured panel mount IFR GPS COM available. The GNC 300 represents GARMIN’ s commitment to provide an accu- rate, easy-to-use GPS for all of your aviation needs. Before installing and getting started with your unit, please check to see that your package includes the following items.

  • Page 6: Warranty

    GARMIN authorized warranty service facility. Every GARMIN GPS is built to exacting standards to provide years of trouble-free service. GARMIN warrants this product to be free from defects in materials and workmanship for one year from the date of purchase.

  • Page 7: Table Of Contents

    GNC 300 Takeoff Tour ........

  • Page 8: Table Of Contents

    Appendix C: Simulator ........107 Appendix D: GNC 300 Abbreviations and Messages ....109 Appendix E: Specifications .

  • Page 9: Key And Knob Functions

    Key and Knob Functions The power/volume knob controls unit power and radio volume. The squelch button activates automatic squelch control. The direct-to key performs an instant direct-to, allows you to enter a waypoint, and sets a direct course to the destination. The nearest key is used to obtain information on the 9 nearest airports, VORs, NDBs, intersections, user waypoints and 2 nearest FSSs.
  • Page 10 The cursor key is used to activate or deactivate the cursor in the separate areas of the GNC 300. Pressing C once will activate the cursor in the comm ‘window’ and enable the pilot to change frequencies. Pressing C again will activate the cursor in the nav window (indicated by flashing characters in a nav window field).

  • Page 11: Takeoff Tour

    The Takeoff Tour assumes that the GPSCOM and antennas have been properly installed and you have not changed any of the GNC 300’ s default settings. If you have changed any of the factory default settings (position format, units of measure, selectable fields, etc.), the pictures used may not match your configuration.

  • Page 12: Acquiring Satellites

    Following the first-time use of your GNC 300, the time required for a position fix will vary- usually from 2 to 5 minutes. If the unit can only obtain enough satellites for 2D navigation (no altitude), the unit will use the altitude provided by your altitude encoder (if one is connected and working).
  • Page 13 While the GNC 300 is acquiring a position, let’ s take a minute to dial in the active and standby frequencies you’ll be using for the first phase of your flight. The GNC 300’ s display can be broken down into two separate ‘windows’, the comm window (the top line of the display) and the GPS window (the bottom three lines of the display).
  • Page 14 • Present Position— Latitude and longitude displayed in degrees/minutes • Reference Waypoint— The bearing and distance to the nearest airport The position page is one of six pages available under the GNC 300’ s NAV key: • CDI page • Position page •...

  • Page 15: Direct-To Navigation

    The GNC 300 uses direct point-to-point navigation to guide you from takeoff to touchdown in the IFR environment. Once a destination is selected, the unit will pro- vide speed, course and distance data based upon a direct course from your present position to your destination.

  • Page 16: Navigation Diagram

    CDI page with ‘brg’ and ‘trk’ displayed. NAVCOM Page In addition to the destination field and graphical CDI, the GNC 300 CDI page fea- tures four selectable fields for various navigation data so that the page may be config- ured to your own preferences (see Section 1 for more information). The default set- tings for the CDI page are: •...

  • Page 17: Nearest Waypoints

    2. Press 3. Press The GNC 300’ s NRST key provides the nine nearest airports, VORs, NDBs, inter- sections and user waypoints, as well as the two closest FSSs (Flight Service Stations) and any SUA (special use airspace) alerts for your present position. The nearest way- point feature is a handy safety feature that may be used to execute a quick direct-to in case of an in-flight emergency or to review the closest facilities to your present position.

  • Page 18: Satellite Acquisition

    2. Press to confirm. Congratulations! You’ve now gone through the basic operation of the GNC 300. We encourage you to experiment with your new GPSCOM to get to know all the advanced navigation features it has to offer. If you’d like a little more practice, try using the built-in simulator described in Appendix C.

  • Page 19: Navigation Key

    Whenever the NAV key pages are in use, the indicator light (U) next to the NAV key will illuminate. If the GNC 300 requires you to enter data on a navigation page, the MSG indicator will flash and a message prompt with specific instructions will appear.

  • Page 20: Position Page

    ‘no actv wpt’ message, and only speed and track data will be available. The CDI field is also used to display the GNC 300’ s turn anticipation and waypoint alert data during route operations (see Section 5).
  • Page 21 The following functions may be displayed in the ground speed field: • gs— Your present speed over the ground. • str— Steer direction and distance, or digital crosstrack error. An ‘L’ or ‘R’ indicates which direction to steer, while the distance value indi- cates how far you are off course.
  • Page 22 4. Rotate to highlight another field, or The next page available from the GNC 300’ s NAV key is the navigation com- munications (NAVCOM) page. The NAVCOM page provides a list of the airport frequencies at your departure and arrival airports, allowing convenient selection of every frequency you’ll need along your flight path.
  • Page 23 If a frequency has sector or altitude restrictions, the frequency will be followed by a ‘brg?’. To view restrictions on a frequency: 1. Press twice to activate the cursor in the GPS window. 2. Rotate to highlight the ‘brg?’ next to the frequency you wish to view. 3.
  • Page 24 Consult current charts and NOTAMS for more complete information. The GNC 300 position page displays your present latitude and longitude, altitude and a reference waypoint field; and is also used to enter the altimeter setting during approach operations. The altitude and reference waypoint fields are selectable to configure the page to your own preferences and current navigation needs.
  • Page 25 DME arc reference (see Section 6). Note the waypoint category is listed as ‘wpt’ rather than ‘VOR’ because the GNC 300 is not using the nearest VOR for the reference waypoint. REFERENCE...
  • Page 26 Status page with EPE displayed. Status page with DOP displayed. The GNC 300’ s satellite status page provides satellite information to monitor GPS coverage and receiver performance. This is helpful when you may be experienc- ing low signal levels due to poor coverage or installation problems.
  • Page 27 The receiver status field, located at the top left of the page, can display the fol- lowing messages under various conditions: Search sky - The GNC 300 is searching the sky for visible satellites. You will be informed with the message ‘Searching the Sky’.

  • Page 28: Fuel Planning

    REFERENCE SECTION NAV KEY Fuel Planning Satellite Data Page Viewing individual satellite information. The second and third lines of the satellite status page provide the satellite number and signal strength of each satellite in view. Additional information regarding each satellite’ s azimuth, elevation and other data is also available. To view individual satellite information: 1.
  • Page 29 In addition to the other four pages, the GNC 300 features two menu pages to per- form a host of planning and navigation functions. NAV Menu 1 provides access to the following functions: • Trip Planning • Density altitude/true air speed calc.
  • Page 30 REFERENCE SECTION NAV KEY VNAV & Checklists Density Altitude & True Airspeed Nav Menu 1 Density Altitude/True Airspeed Page Fuel Planning Page The density altitude/true airspeed function is also accessed from NAV Menu 1. Density altitude is the altitude at which your aircraft will perform depending on several environmental conditions, including air pressure and total air temperature (the tempera- ture including the effect of speed, read on a standard outside temperature gauge on most aircraft).
  • Page 31 Press The GNC 300 will calculate the range and endurance (how long the fuel will last) of your aircraft. These are found in the first field on the bottom row of the page. The fuel left on board (lfob) and reserve after the selected direct-to, leg or route will also be displayed in the second field on the bottom row.
  • Page 32 Winds Aloft Page Vertical Navigation Page The GNC 300’ s winds aloft function is used to calculate the true direction and speed of the winds aloft, and indicates whether you are flying with a head wind or tail wind, and the wind speed.
  • Page 33 ‘VNAV cancelled’ message. The GNC 300 will allow you to create up to nine checklists with 30 items each to remind you of repetitive tasks that can be called up at any time for review. The checklist feature is useful for creating pre-flight checklists, landing checklists, emergency proce- dures, etc.
  • Page 34 1. To delete a checklist item, highlight the desired item and press 2. To delete an entire checklist, highlight the desired list and press The GNC 300’ s NAV Menu 2 provides access to various timer and planning func- tions, including: •...
  • Page 35 The timer will then begin to count up, keeping track of how long it has been since it expired. The timers run, if not altered, anytime the GNC 300 is on. The GNC 300 clock function keeps track of both UTC time (Greenwich Mean Time or Zulu Time calculated from the satellites) and local time, and allows you to designate which format is used for ETA calculations.

  • Page 36: Raim Prediction

    RAIM is not available. RAIM prediction will help you plan for a pending flight to confirm that the GNC 300 can be used for an approach, and should be calculated the night before or the day of the desired flight.
  • Page 37 Change oil, Switch fuel tanks, Overhaul, etc. For example, if you enter ‘Change Oil’ to be displayed in 30 hours, the message ‘Change Oil’ will be displayed after the GNC 300 has been on in Normal operating mode for 30 hours. After appearing, the message will be dis- played each time the GNC 300 is turned on until it is changed or deleted.
  • Page 38 Calculations Sunrise/Sunset Planning Page The GNC 300 sunrise/sunset planner allows you to calculate the sunrise and sun- set times for a specified date for your present position or any waypoint. To calculate sunrise and sunset times at a waypoint or at your present location: 1.
  • Page 39 Section 2 Communicating with the GNC 300 The GNC 300 features a digital VHF radio that provides a seamless transition from communication to navigation, bringing the two most important functions in flying together in one panel-mount unit. The GNC 300 operates in the aviation voice band, from 118 to 136.975 MHz, in 25 kHz steps.

  • Page 40: Entering Waypoints

    To select a frequency from a list, highlight the desired frequency and press ENT. During the course of navigating with the GNC 300, there may be times when you need to quickly select a comm frequency while you are in the middle of entering data in the GPS window.
  • Page 41 To adjust the radio volume: 1. Rotate the knob. Whenever the GNC 300 is powered up, the automatic squelch will be in the ‘on’ position, allowing only transmissions which are powerful enough for clear broadcast to be received. Manual squelch control is not available.

  • Page 42: Section 3: Waypoint And Database Information ( W Key)

    Waypoint information is available through four primary waypoint pages accessible from the GNC 300’ s WPT key. The waypoint pages may be scrolled through by press- ing the WPT key and rotating the outer knob until the desired page is displayed, or by pressing the WPT key repeatedly.
  • Page 43 The GNC 300 organizes waypoints into one of five waypoint categories for your con- venience. Each waypoint category provides different types of detailed information for a selected facility: • Airports - Identifier, city/state, country, facility name, position (lat/lon), elevation, fuel services and communications frequencies.

  • Page 44: Airport Runway

    5. Use to enter the location or the name, and press As the information is entered, the GNC 300 will display any entries in its database that match the letters you have entered. If duplicate entries exist for the entered iden- tifier, name or location, additional entries may be viewed by rotating K.

  • Page 45: Vor Information

    Once a waypoint category and identifier have been selected, the GNC 300 will provide extensive information through a set of waypoint pages for the selected catego- ry. We’ll now go through the pages available for each waypoint category in the order they appear on the waypoint menu page: airports, VORs, NDBs, intersections and user waypoints.
  • Page 46 Airport Position Page Airport Communication Page Airport Runway Page The GNC 300 features six airport pages: airport identification— allows entry of desired airport by identifier, facility name or city; displays region and/or country of facility. airport position— allows entry of desired airport by identifier; displays latitude, longitude and elevation;...

  • Page 47: Ndb Information

    Elevation— In feet or meters Usage/Fuel— If the airport is for military use, it will display ‘military’. If it is private, the GNC 300 will display ‘private’. If it is a pub- lic airport, it will display the fuel type(s) available: •...

  • Page 48: User Waypoints

    Whenever there are more than two available procedures for a selected category, the GNC 300 will display a scrolling arrow prompt on the left side of the list. To view addi- tional procedures, simply rotate K with the cursor removed. As you scroll through the list, the arrow prompt will point ‘down’...
  • Page 49 The airport communication page displays the radio frequencies and usage for the selected airport, as well as sector and altitude restrictions. To view the communication page from any of the airport information pages: 1. Rotate with the flashing cursor removed to display the communication page. 2.

  • Page 50: Auto Store

    REFERENCE SECTION WPT KEY Autostore ™ & Airport Runway Page User Comments Airport Runway Page for KICT. To view additional runways, rotate the inner knob in the direction of the arrow prompts. The airport runway page displays runway designations, length, surface and lighting for the selected airport, as well as ILS/localizer and/or pilot-controlled light- ing frequencies.

  • Page 51: Vor Information

    VOR Information The GNC 300 features three VOR waypoint pages: VOR identification— allows entry of desired VOR by identifier, facility name or city; displays region and/or country of facility. VOR position— allows entry of desired VOR by identifier; displays latitude, longitude and frequency; provides magnetic variation, weather broadcasts and DME/TACAN information.

  • Page 52: Proximity Waypoints

    NDB Information NDB Position Page The GNC 300 also uses identification, position and comments pages for NDB information. The NDB waypoint pages are used in the same manner as VOR pages: NDB information is accessed by entering the desired facility’ s identifier, city or name on the NDB identification page (see page 34).

  • Page 53: Intersection Information

    Intersection Information Intersection Position Page The last database waypoint category available is intersections. Two intersection pages are available: intersection position and intersection comments. Intersections may be entered by identifier only (not city or name) on either intersection page. To scroll through the Intersection pages: 1.
  • Page 54 In addition to the airport, VOR, NDB and intersection waypoints contained in your NavData® card, the GNC 300 allows you to store up to 1,000 user-defined waypoints. Once a user waypoint is created, two user waypoint pages will display the following information: •...

  • Page 55: Route Overview

    If the waypoint identifier entered does not exist in the database, you will be prompted to select a method to enter the new waypoint’ s position into the database. If the waypoint exists (you’re just reviewing or editing a user waypoint), skip step 4 and move on to the next set of instructions.

  • Page 56: Route Information

    To create a user waypoint from your present posi- tion, leave the reference waypoint field blank and enter a bearing and distance from your present position. The GNC 300 will calculate the new waypoint’s coordinates automatically. To enter/edit a user waypoint position from a reference waypoint: 1.
  • Page 57 This will display the ‘Save’ waypoint screen, which will allow you to rename the waypoint and choose the route for it to be added to. The GNC 300 will assign the next available three-digit number as the default waypoint name, preceded by a ‘+’...

  • Page 58: Editing Routes

    ‘Proximity overlap’. This message will be displayed each time you turn on the GNC 300 for as long as the overlap remains. Warning: If you enter the overlap area you will only be informed of the nearest proximity waypoint.
  • Page 59 The third page available from the GNC 300’ s WPT key is the user waypoint list, which can be used to quickly scan, review, rename or delete user waypoints. To display the user waypoint list: 1. Press and use to display the user waypoint list.
  • Page 60 Entering waypoint comments. Waypoints with Comments List The last page available through the GNC 300’ s WPT key is the waypoint com- ments page, which lists all waypoints that have a user comment. User comments may be added to 250 waypoints stored in the user or NavData you to note two lines of special information concerning a particular waypoint.
  • Page 61 The GNC 300’ s extensive waypoint database makes it possible for several way- points to share the same identifier. To ensure that you are selecting the waypoint desired, the GNC 300 will always offer the waypoint confirmation page (which shows the waypoint’ s position) when an identifier is entered for a particular function.

  • Page 62: Parallel Track

    (identifier, facility or city name). 5. Use to enter the letters of the identifier, city or facility name. The GNC 300 will scan the database and display the first waypoint that matches your entry. 6. Press to accept the waypoint, and function being used.
  • Page 63 Special Use Airspace (SUA) you may be in or near. The NRST key can be used in conjunction with the GNC 300’ s direct-to function to quickly set a course to a nearby facility in case of an in-flight emergency.
  • Page 64 SUA that meets the above conditions will be displayed on the nearest pages. The next page available under the GNC 300’ s NRST key is the SUA alert page. The SUA alert page will alert you with up to nine controlled or restricted airspaces near or in your flight path, according to the following conditions: •...
  • Page 65 To toggle between the SUA name and controlling agency display: 1. Rotate one stop in either direction. If the SUA name or controlling agency is too long to fit on the display, the GNC 300 will automatically scroll to display the rest of the information. Alert type...
  • Page 66 REFERENCE SECTION NRST KEY SUAs and other SUA Messages Nearest Waypoints Frequency information for SUA. The following SUA types can appear in the SUA type field: Message Airspace Type alrt - Alert caut - Caution cl B - Class B cl C - Class C - ICAO Control Area...
  • Page 67 All SUA alert messages except for prohibited areas may be turned on or off through the GNC 300’ s unit settings options, found under the MSG key (see Section 7). The GNC 300 will also automatically turn off SUA alerts during approach opera- tions (see Section 6).

  • Page 68: Current Messages

    ACTIVE LEG KTUL As you pass each waypoint in the route, the GNC 300’ s automatic leg sequencing and turn anticipation features will automatically select the next waypoint as the ‘active to’ waypoint and provide smooth steering guidance around the turn. If you are not currently navigating a particular route leg (e.g., your starting position is not a...
  • Page 69 1. Place the flashing cursor over the destination field on the CDI page. 2. Press \. The destination field will go blank. 3. Press E. The GNC 300 will resume navigating Route 0 (the active route) if available. to accept the direct-to confirmation page.
  • Page 70 5. Press to accept the course, and The GNC 300 will now use the selected course for your CDI and DTK steering guidance. To reset the course to a GPS-calculated direct course from your present position, simply press D, followed by E.
  • Page 71 The GNC 300 lets you create up to 20 routes (numbered 0 through 19), with up to 31 waypoints each. Routes are created, copied and edited through the R key, which features five route pages selectable using the GNC 300’ s outer knob. The approach select, SID select and STAR select pages, used for approach navigation, are discussed in Section 6.

  • Page 72: Magnetic Variation

    4. Cumulative distance of route 5. Comments/Parallel track offset field The GNC 300’ s route catalog page is used to create, edit, delete or copy routes, and serves as the main page for a host of functions. These include route activation, determining the closest point of approach and search and rescue operations.
  • Page 73 The route editing function allows you to create new routes and edit existing routes. Creating routes before takeoff can help make route operations easier during your flight. To create or edit a route from the route catalog page: 1. Use to display the route number you would like to edit.
  • Page 74 ‘activate?’. Press After travelling a route or creating a route with the GNC 300’ s AutoStore the route activation field may be used to activate the route in reverse order. To activate a route in reverse order: 1.

  • Page 75: Navigation Units

    The CPA function calculates the closest distance that a route will pass to a refer- ence waypoint, and helps you create new route waypoints referencing a NAVAID. Calculating Closest Point of Approach. To calculate the closest point of approach (CPA) from the route catalog page: 1.
  • Page 76 WAYPOINT Performing a search and rescue operation. The GNC 300’ s search and rescue function provides navigation guidance for search and rescue operations, navigating in a ladder pattern to maximize coverage and efficiency. This is done in reference to two waypoints called ‘anchor waypoints’.

  • Page 77: Map Datums

    ‘active leg’ to help avoid certain airspaces or regions or bad weather. The GNC 300’ s parallel track feature will automatically guide you along a selected offset from the active leg (bearing and distance information will be to the waypoints along the original course).

  • Page 78: Data Transfer

    Flying and Modifying the Active Route Once a route has been created and activated, the GNC 300 will provide navigation to each route waypoint through the active route and CDI pages. From the active route pages, you may also create and modify the active route, and insert an approach, SID or STAR for your flight.
  • Page 79 The ‘cum or leg’ field can be selected to display cumulative distance and ete/eta or the distance and ete/eta for each individual route leg. If cumulative is selected, the first leg’ s distance will be displayed. The second leg will represent the first leg’ s dis- tance plus the second leg, and so on.
  • Page 80 The waypoint sequencing field, located at the bottom left of the direct-to confirmation page, indicates the current setting of the external GPS SEQ switch. Whenever the switch displays a ‘HOLD’ status, the GNC 300 will hold on the current ‘active-to’ waypoint as your navigation reference and prevents the GPS receiv- er from sequencing to the next waypoint in the route.

  • Page 81: Turn Anticipation

    This leg transition is based on the aircraft’ s actual ground speed and the difference between the course angle of the two legs. The GNC 300 will automatically sequence to the next leg when you are abeam the ‘active to’ waypoint and on the curved transition segment (the to/from indicator on the CDI will flip momentarily).

  • Page 82: Approaches, Sids And Stars

    The non-precision approaches available in the GNC 300 are executed using the GPS route features covered in Section 5, so it’ s important to understand routes before attempting approach navigation. A GPS approach is a sequence of waypoints linked together as a subroute which replaces your destination airport waypoint when selected.
  • Page 83 The NAV/GPS switch determines which data (GPS or NAV1) will be displayed on the HSI and used by the autopilot/flight director. The current selection will be indicated by an annunciator light. If power to the GNC 300 is lost, the system will automatically revert to NAV1.
  • Page 84 IAF and FAF at the same waypoint). Whenever the GPS SEQ switch is set to the AUTO ACTV HOLD position, the GNC 300 allows you to select the desired course to/from a way- point using the HSI, much like a VOR. Whenever the GPS SEQ switch is released from the HOLD position, the GNC 300 will ‘capture’...
  • Page 85 Think through the approach examples— this will assist you in getting the greatest benefit from the GNC 300. There are a few basic rules that apply to all GPS approaches. Remembering these rules will assist you in understanding the approach procedures and ensure the greatest margin of safety for your flight.
  • Page 86 • During a GPS approach, keep in mind that your external HSI will display the same CDI needle deflection and scale as the CDI on the GNC 300, which will transition from 5.0 to 0.3 nm through the approach. Also note that unlike a...
  • Page 87 Initial Approach Fix. 3. Transition to the Arm Approach Phase The GNC 300 will automatically arm the approach 30 nm from the desti- nation airport. The CDI scale will begin to ramp down from the 5.0 nm to the 1.0 nm scale, and the GPS APR annunciator will indicate an ‘ARM’...
  • Page 88 6. Missed Approach Procedure The GNC 300’ s automatic waypoint sequencing stops at the missed approach point. Once you have crossed the MAP, the GNC 300 will give you the option of flying direct to the missed approach holding point: a.
  • Page 89 Selecting and Loading an Approach When an arrival airport is selected with the direct-to key (or created and activated in a route to the arrival airport), the approaches for your arrival airport become avail- able through the approach select page, which can be viewed by pressing R and rotating the outer knob.
  • Page 90 5.0 nm to the 1.0 nm scale as you make your way to the FAF. If the approach has been disarmed and the aircraft is within 3 nm of the FAF, the GNC 300 will prompt you to rearm the approach.

  • Page 91: Understanding Gps

    7. Upon reaching the FAF, the GNC 300 will automatically sequence to the MAP waypoint. To fly a missed approach procedure: If an approach is terminated, the GNC 300 may be used to navigate to the missed approach holding point using one of the following procedures.
  • Page 92 5. Set the GPS SEQ switch to the AUTO position for navigation to the missed approach holding point. After a missed approach, the GNC 300 will allow you to repeat the same approach procedure and select the approach waypoint to which you have been cleared as the next active to waypoint.
  • Page 93 The GNC 300’ s approach select page allows you to review the available approach procedures at the destination airport. From the procedures list, you may select and activate a new procedure on the fly. The active approach is indicated by an on-screen asterisk, and the scrolling arrow prompt indicates which direction to scroll to view additional procedures.
  • Page 94 APPROACH NAVI- SECTION APPROACH NAV GATION GPS Approach Examples GPS APproach BAY CITY ff13 344 BYY MAGUS 1800 116 (7.9) n13hp 10 NM Ref: NDB RWY 13 approach at Bay City TX (3R1) GPS APPROACH EXAMPLES In the examples that follow, the GPS waypoints are shown along the approach path.
  • Page 95 1. Select the destination airport (KFDK) using the to the destination airport. 2. Select the desired approach (gps rw05) from the approach select page. The GNC 300 will automatically select MRB as the IAF since it is the only IAF available.
  • Page 96 2. Fly towards the IAF of the approach (the JAMES intersection). 3. Two nm BEFORE crossing the IAF, set the GPS SEQ switch to the HOLD position. This prevents the GNC 300 from automatically sequencing to the missed approach point before the required procedure turn is completed.
  • Page 97 (KFOE) and illustrates an approach based on a DME arc. Although DME arc approaches are not based on a direct course, the GNC 300 will still provide approach navigation guidance through the arc by constantly displaying your distance and bear- ing from the DME reference navaid on the position page.
  • Page 98 APPROACH NAVI- SECTION APPROACH NAV GATION VOR/DME Arc Example Radar Vector VOR/DME RWY 21 TOPEKA/ FORBES FIELD (FOE) 3000 205 (7) TOPEKA (IAF) 2600 MISSED APPROACH VORTAC CLIMB TO 3000 VIA HEADING 240 AND TOP R-213 TO ERASE 25 DME AND HOLD. ERASE 2600 MISSED APPROACH...
  • Page 99 IAF from the database and set the GPS SEQ switch to HOLD while you fly the vectors to the active approach waypoint. To accom- modate radar vectors, the GNC 300 allows manual selection of any approach way- point as the destination waypoint.
  • Page 100 Selecting & Selecting a SID. Selecting a SID transition. The Jeppesen database used in the GNC 300 features Standard Terminal Arrival Routes (STARs) and Standard Instrument Departures (SIDs) that may be placed into any active or stored route. Available SIDs may be selected for the departure airport at any time in the active route as long as the departure airport is the first route waypoint and the route con- tains more than one waypoint.
  • Page 101 The SID select page also allows you to review all the available SIDs for the depar- ture airport and select, delete or change the active SID. To replace/delete the active SID... 1. Press and rotate until the SID select page appears. 2.
  • Page 102 Selecting a STAR. Selecting a STAR transition. Standard Terminal Arrival Routes (STARs) used in the GNC 300 are selected and activated with the same procedures as SIDs. Available STARs may be selected for the destination airport at any time in the active route as long as the destination airport is the last waypoint in the active route or the direct-to waypoint.

  • Page 103: Unit Settings ( M Key)

    The STAR select page also allows you to review all available STARs for the destina- tion airport and select, delete or change the active STAR. To replace/delete a STAR... 1. Press and rotate until the STAR select page appears. 2. Press twice.
  • Page 104 THIS PAGE INTENTIONALLY LEFT BLANK...

  • Page 105: Messages And Unit Settings

    Section 7 Messages and Unit Settings The GNC 300’ s MSG key provides access to system messages and allows you to customize your GPSCOM to your own preferences through a settings submenu. Whenever the GNC 300 needs to alert you to a navigation, communication or system message, the annunciator light next to the M key will flash.
  • Page 106 Entering a user magnetic variation. The first available page under the settings submenu is the CDI settings page, which allows you to define the scale of the GNC 300’ s course deviation indicator. To change the CDI scale: 1. Press and hold , and rotate to select the CDI settings page.
  • Page 107 ‘user’ setting will correct information to an entered value. The GNC 300’ s arrival alarm can be set to notify the pilot with a message when you have reached a user defined distance to a final destination waypoint (the direct-to way- point or the last waypoint in a route).
  • Page 108 This will increase the remote battery life in event of power failure. During this time, the GNC 300 will continue to navigate and track satellites, but will not display information until a key is pressed or a knob is turned.
  • Page 109 The GNC 300 can be configured to display data in standard or metric units of mea- sure. These apply to: distance, position, speed, altitude, fuel, pressure and temperature. To change the units of measure: 1.
  • Page 110 APPENDIX D SECTION UNIT SETTINGS Messages & Units of Measure Abbreviations Units of measure settings (metric). The available units of measure are: position : • degrees, minutes and seconds (dms) [hddd° mm’ ss.s”] • degrees and minutes (dm) [hddd° mm.mmm’] altitude : •...
  • Page 111 The Special Use Airspace settings page will allow you turn the controlled/restricted air- space message alerts on or off. This will not affect the alerts being listed on the nearest page. It will simply turn off the warning when you are approaching or near an SUA. Warnings can be turned off for the following airspaces: class B/cta : ICAO control area...

  • Page 112: Getting Started

    By default, your unit calculates positions using the WGS-84 map datum. If you are using charts based on another datum, you must set the GNC 300 to use the same datum. Using a map datum that does not match the sectionals you are using can result in significant differences in position information.

  • Page 113: Unit Settings

    The last page available under the GNC 300’ s setup menu is the I/O setup page. The I/O setup page lets you configure the GNC 300 to output to an RS-232 mapping device or a PC (with the optional GARMIN PC Kit or other mapping software) and select the appropriate baud rate.

  • Page 114: Status & Position

    The NavData card supplied with your GNC 300 can be installed or removed when the GNC 300 is on or off. Insert the card with the thumb tab at the top, and the beveled corner at the bottom. If the NavData card is not present when the unit is powered on, you will receive a ‘No Jeppesen database’...
  • Page 115 7. To continue with more data transfer types, repeat steps 4, 5 and 6. Otherwise, press E when ‘ok?’ is highlighted. 8. Turn the GNC 300 off and replace the user data card with a NavData card. The GNC 300 is now ready for normal operation.

  • Page 116: Section Installation

    2. Rotate the wrench counterclockwise until it stops to ensure the pawl latch is in the proper position. 3. Insert the GNC 300 into the aviation rack and rotate the wrench clockwise to secure the unit. To ensure proper connector seating, gently press on the left side of the unit until tight- ened.

  • Page 117: Appendix C: Simulator

    AC adapter. The simulator is not accessible when the GNC 300 is running off the master avionics switch. All way- point and route planning done in simulator mode will be saved in the unit’ s internal memory.
  • Page 118 4. Press to confirm the ‘ok?’ prompt. The position page will now appear, and you may now use most of the GNC 300 navi- gation features for practice and planning. If you are practicing non-precision approaches, you may not have altitude, OBS input or the external switches necessary to simulate all aspects of actual navigation.
  • Page 119 Appendix D GNC 300 Messages and Abbreviations The GNC 300 uses the message page to communicate important information to you. Some messages are advisory in nature, others are warnings that may require your intervention. This appendix provides a complete list of GNC 300 messages and their meanings.
  • Page 120 COM failed - The comm in the GNC 300 has failed. Take the unit to an authorized GARMIN service center. Comment memory full - The waypoint comment memory is full. You must delete existing waypoint comments before adding new ones.
  • Page 121 An inaccurate altitude will directly translate into an inaccurate posi- tion fix. Need pres - press NAV - The GNC 300 needs the altimeter setting at the arrival airport to navigate an approach. Press NAV and enter the altimeter setting on the position page.
  • Page 122 - The parallel track distance is too large for the active route. Osc needs adjustment - The GNC 300 has detected excessive drift in its inter- nal crystal oscillator which may result in longer acqui- sition time. The unit should be taken to an authorized GARMIN service center immediately.
  • Page 123 MAP), execute the published missed approach procedure. RAM failed - The GNC 300 has detected a failure in its inter- nal memory. If the message persists, the GNC 300 is unusable and should be taken to an authorized GARMIN service center.
  • Page 124 - One or more route waypoints were moved at least 0.33 arc minutes due to a database change. Searching the sky - The GNC 300 is in the search-the-sky mode. Allow the unit to complete data collection before turning it off. Select auto seq mode - The GPS SEQ switch should be set to the AUTO position to continue navigation.
  • Page 125 Wpt exists _____ - You have entered a waypoint name on the AutoStore™ page or user waypoint catalog page that already exists in memory. Enter a waypoint name that does not exist. Wpt memory full - The waypoint memory is full. You should delete unused waypoints to make room for new way- points.
  • Page 126 APPENDIX D SECTION MESSAGES & Messages & ABBREVIATIONS Abbreviations This section of Appendix C provides a complete list of GNC 300 abbreviations and their meanings. ALT- Altitude DIS- APP- Approach DME - APR- Approach DOP- APT- Airport Waypoint DTK- ARV-...
  • Page 127 JET A- Jet Fuel - Type A JET B- Jet Fuel - Type B Kilometers Per Hour Kilometers OBS- Knots Pounds OTH- LCL- Local ºC- LEN- Length ºF- LFOB- Leftover Fuel On Board LFLOW- Left Fuel Flow POSN- LOC- Localizer PRES- Liters MAG VAR-Magnetic Variation...
  • Page 128 APPENDIX D SECTION MESSAGES & Messages & ABBREVIATIONS Abbreviations Receive Only USR- SAR- Search And Rescue UTC- SEC- Seconds SEQ- Sequence SGL- Signal VNAV- SID- Standard Instrument VOR- Departure WPT- SLCT- Select SRFC- Surface STAR- Standard Terminal Arrival Route STR- Steer To TACAN- TACtical Air Navigational Aid TAS-...

  • Page 129: Appendix E: Specifications

    ** Subject to accuracy degradation to 100m 2DRMS under the US DOD-imposed Selective Availability Program. Whenever the GNC 300 is connected to the optional remote battery pack and power from the master switch is lost, the unit will revert to bat- tery power.

  • Page 130: Appendix F: Map Datums

    APPENDIX F SECTION MAP DATUMS Map Datums Appendix F Map Datums ADINDAN Ethiopia, Mali, Senegal, DOS 1968 Sudan AFGOOYE Somalia EASTER ISLAND 1967 AIN EL ABD 1970 Bahrain Island, Saudi Arabia EUROPEAN 1950 ANNA 1 ASTRO 1965 Cocos Islands ARC 1950 Botswana, Lesotho, Malawi, Swaziland, Zaire, Zambia, Zimbabwe...
  • Page 131 OLD HAWAIIAN OAHU LUZON PHILIPPINES Philippines OMAN (excluding Mindanao Isl.) ORD SRV GRT BRITAIN MAHE 1971 Mahe Island MARCO ASTRO Salvage Islands PICO DE LAS NIEVES MASSAWA Eritrea (Ethiopia) PITCAIRN ASTRO 1967 MERCHICH Morocco PORTUGUESE 1973 MIDWAY ASTRO 1961 Midway Island POTSDAM MINNA Nigeria...

  • Page 132: Troubleshooting Q & A

    (some VOR/VORTAC identifiers are similar to airport identifiers). If a destination airport does not have a GPS approach, the GNC 300 will display a ‘no approach in database for arrival way- point’ message. For more on selecting an approach, see Section 6.
  • Page 133 Can I file slant Romeo ‘/R’ using my GPS? Yes, you may file your flight plan as /R if your GNC 300 is a certified A1 or A2 installation. If you are flying enroute, you may fly /R with an expired database only after you have verified all route waypoints.
  • Page 134 HSI two seconds before changing the GPS SEQ switch to the AUTO position. This allows the the desired course to ‘settle’ prior to the GNC 300 using it. Once the GPS SEQ switch is set back to the AUTO position, the GNC 300 will use the HSI course until you have crossed the active-to waypoint and sequenced to the next route waypoint.
  • Page 135 Begin the turn when the annunciator goes steady. 2) A flashing ‘next dtk’ prompt will appear on the GNC 300’ s CDI field. Set the HSI to the next dtk value when the waypoint annunciator starts flashing. 3) The To/From indicator on the GPS CDI will flip momentarily to indicate that you have crossed the midpoint of the turn.

  • Page 136: Appendix G: Troubleshooting/Q & A

    To activate navigation to the first missed approach waypoint after crossing the MAP, press D, then E. The GNC 300 will provide direct navigation to the holding point. If you do not have direct clearance to the holding point, set the GPS SEQ switch to the HOLD position until you have intercepted the inbound course to the holding point.
  • Page 137 Appendix H Index Approach timer Abbreviations 116-118 Arrival alarm setting AC adapter iii, 106-107 Arrow key Accessory list AutoStore™ Activating a route Autotune Activating a route in reverse Active-from waypoint Active route page 61,68-69 Battery saver Adding waypoints to a route Airport communications page Airport indentification page Cautions...
  • Page 138 Deleting waypoints from routes 49,63 Density altitude Identifiers Direct-to 5,58-60 Inner Knob Direct-to Key Initial position reference page Display timeout Installation of the GNC 300 Intersections Duplicate Waypoints Interfaces I/O setup pages Editing routes Editing user waypoints 44-46 Key functions Emergency channel select...
  • Page 139 RAIM NAVCOM Page 5,12-13 RAIM Prediction NavData cards Receiver status Navigation diagram Removal of the GNC 300 NAV key vi,9-20 Renaming user waypoints NAV menu 1 Replacing user data NAV menu 2 Restoring user data Nav units 95,100 Reversing a route...
  • Page 140 APPENDIX G SECTION INDEX Index Sunrise/Sunset Table of Contents v-vi TACAN Time Trip planning Trip timer 25,99 True air speed Turn anticipation Unit settings 95-103 Updating user data User comments UserData cards User map datums User waypoints 33,44-46,49 Vertical navigation (VNAV) 22-23 Volume VORs...
  • Page 142 ® © 1996 GARMIN Corporation 1200 East 151st St., Olathe, KS 66062 Part No. 190-00067-00 Rev. A...

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