250 Quick Ref 7/14/98 9:14 AM Page 3 Comm Window Window CURSOR CONTROL The cursor key is used to activate and deactivate the cursor in the comm and GPS windows, and is used to highlight fields for data entry, changing display data or cycling through available options.
250 Quick Ref 7/14/98 9:14 AM Page 4 ACTV STBY GNC 250 CLR ENT CRSR NRST DATA ENTRY The outer knob is used to advance through pages, select comm frequency (MHz), advance the cursor or move through data fields. The inner knob is used to change data, select comm frequency (KHz), or scroll through additional information that cannot fit on the screen.
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250 Quick Ref 7/14/98 9:14 AM Page 5 POWER UP Insert data card in card slot. B clockwise to turn the unit on and adjust volume. The Rotate the power/volume knob welcome page will appear while the unit performs a self test. E to confirm the database prompt.
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250 Quick Ref 7/14/98 9:14 AM Page 6 TO SELECT A DIRECT TO DESTINATION Press K to select the first character of the destination waypoint’ s identifier. Remember to Rotate use the ICAO identifier if you are entering an airport as your destination (i.e., KOSH for Wittman Regional Airport).
250 Quick Ref 7/14/98 9:14 AM Page 7 TO SELECT COMM FREQUENCIES C repeatedly to highlight the standby field (e.g., “<121.75>”). Press O to select the desired megahertz (to the left of the decimal). Rotate K to select the desired kilohertz (to the right of the decimal). Rotate C twice to remove the cursor from the comm and GPS windows.
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250 Quick Ref 7/14/98 9:14 AM Page 8 TO AUTO TUNE A FREQUENCY DISPLAYED IN THE GPS DATABASE E with the cursor off to select the Press frequency as the standby frequency. TO AUTO TUNE A FREQUENCY FROM A LIST IN THE GPS DATABASE C twice to activate the cursor in the Press...
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250 Quick Ref 7/14/98 9:14 AM Page 9 Waypoint Category Airport Identification Airport Position Proximity Waypoint Page Airport Comments Airport Communications User Waypoints Page Each waypoint category features a set of waypoint pages accessible Airport Runway by rotating the outer knob with the cursor inactive.
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250 Quick Ref 7/14/98 9:14 AM Page 10 TO ACCESS APT INFORMATION TO SELECT AN APT BY FACILITY NAME OR CITY W key. Press the C twice to activate the cursor. Press E to confirm the ‘apt?’ category. The airport Press identification page will appear with the identifier field ready for entry.
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250 Quick Ref 7/14/98 9:14 AM Page 11 TO SELECT A DIRECT TO DESTINATION D key. Press the Enter the identifier of the destination waypoint. E to accept the identifier, and E again to accept Press the direct-to confirmation page. TO RE CENTER THE D D , followed by E twice.
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250 Quick Ref 7/14/98 9:14 AM Page 12 USING THE DIRECT TO CONFIRMATION PAGE The GNC 250’ s direct-to confirmation page may also be used to select a destination waypoint, review a waypoint’ s position, facility name or location, and manually set a course to/from the destination. TO SELECT A DIRECT TO DESTINATION K and O .
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250 Quick Ref 7/14/98 9:14 AM Page 13 WAYPOINT SEQUENCING AND HOLD MODE The GNC 250’ s waypoint sequencing field allows you to ‘hold’ on a selected waypoint and prevent the GPS from sequencing to the next route waypoint. You may also use the hold mode with the course select feature to maintain a user-defined course to the hold waypoint.
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250 Quick Ref 7/14/98 9:14 AM Page 14 USING THE COURSE SELECT FUNCTION Once the waypoint sequencing field is set to the ‘hold’ position, the selected course will appear at the bottom left corner of the CDI page. TO ENTER A NEW COURSE FROM THE CDI PAGE C twice to activate the cursor in the GPS window.
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250 Quick Ref 7/14/98 9:14 AM Page 15 CDI Page NAV Menu 2 NAVCOM Page NAV Menu 1 Position Page Satellite Status Page The NAV key is used to view navigation, position and status infor- functions. To scroll through the navigation pages, press NAV and mation and provides access to various planning and calculation rotate the outer knob;...
250 Quick Ref 7/14/98 9:14 AM Page 16 NAVCOM PAGE POSITION PAGE CDI PAGE Provides a graphical CDI and dis- Displays the available communication Displays your present position and alti- frequencies of the nearest or departure tude information (altitude, msa or esa). plays your speed and track over the airport, as well as the frequency of the ground, and the distance and ETE to...
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250 Quick Ref 7/14/98 9:14 AM Page 17 Nearest Airport Page Nearest FSS Page SUA Alert Page Nearest User Waypoints Page Nearest VOR Page Nearest Intersections Page Nearest NDB Page The NRST key is used to obtain information on the nine nearest est FSSs;...
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250 Quick Ref 7/14/98 9:14 AM Page 18 NEAREST WAYPOINT INFORMATION SPECIAL USE AIRSPACE ALERTS TO VIEW NEAREST APT INFORMATION T key. The nearest airport will be displayed, subject Press the to the runway surface type and minimum runway length currently selected.
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250 Quick Ref 7/14/98 9:14 AM Page 19 TO CREATE OR EDIT A ROUTE Active Route Page R key and rotate O until the route catalog page appears. Press the K to display the route number you would like to create or edit Rotate (route 0 for the active route).
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250 Quick Ref 7/14/98 9:14 AM Page 20 ACTIVATING AND DELETING ROUTES FLYING THE ACTIVE ROUTE TO REVIEW ROUTE WAYPOINTS FROM THE ACTIVE ROUTE PAGE K in the direction of the arrow prompts. With the cursor off, rotate To manually select your next route waypoint, highlight the desired way- TO ACTIVATE A ROUTE D , followed by E .
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250 Quick Ref 7/14/98 9:15 AM Page 21 The MSG key is used to view system messages and access for more than two seconds, and rotate the outer knob with the GNC 250’s unit settings. To view a message, press MSG. the cursor inactive.
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250 Quick Ref 7/14/98 9:15 AM Page 22 CDI S — allows you to set the CDI scale to 0.3, 1.0 or 5.0 nm scale — allows you to select units of measure for various naviga- ETTINGS NITS OF EASURE or an automatic scale.
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