Garmin G1000 Pilot's Manual page 473

Normal (OBS not activated)
• Automatic sequencing of waypoints
• Manual course change on HSI not possible
• Always navigates 'TO' the active waypoint
• Must be in this mode for final approach course • Cannot be set for final approach course or published holding patterns
When OBS mode is active, the system allows the pilot to set a desired course to/from a waypoint using the
CRS/BARO Knob and HSI (much like a VOR).
The most common application for using the OBS Softkey is the missed approach. The system suspends
automatic waypoint sequencing (indicated by a 'SUSP' annunciation placed on the HSI) when the missed
approach point (MAP) is crossed. This prevents the system from automatically sequencing to the missed
approach holding point (MAHP). During this time, the OBS Softkey designation changes to SUSP. Pressing
the SUSP Softkey reactivates automatic waypoint sequencing. The OBS Softkey then resumes its normal
functionality.
W
hy miGht the system not aUtomatiCally seqUenCe to the neXt WayPoint
The system only sequences flight plan waypoints when automatic sequencing is enabled (i.e., no 'OBS' or
'SUSP' annunciation on the HSI). For automatic sequencing to occur, the aircraft must also cross the bisector of
the turn being navigated. The bisector is a line passing through the waypoint common to two flight plan legs
at an equal angle from each leg.
h
oW Can a WayPoint Be skiPPeD in an aPProaCh
The system allows the pilot to manually select any approach, departure, or arrival leg as the active leg of
the flight plan. This procedure is performed on the MFD from the Active Flight Plan Page by highlighting the
desired waypoint and pressing the ACT Leg Softkey then the ENT Key to approve the selection. The GPS then
provides navigation along the selected flight plan leg.
W
hen Does tUrn antiCiPation BeGin
The system smooths adjacent leg transitions based on a normal 15° bank angle (with the ability to roll up to
30°) and provides three pilot cues for turn anticipation:
- A waypoint alert ('Next DTK ###° in # seconds' or 'Next HDG ###° in # seconds') appears on the PFD 10
seconds before the turn point and flashes as it counts down to zero.
- A flashing turn advisory ('Turn [right/left] to ###° in # seconds') appears on the PFD 10 seconds before the
turn and flashes as it counts down to zero. 'Turn [right/left] to ###° now' or 'Next [DTK/HDG] to ###° now'
is displayed when the pilot is to begin the turn and the HSI (GPS mode) automatically sequences to the next
DTK or HDG value.
- The To/From indicator on the HSI flips momentarily to indicate the midpoint of the turn has been crossed.
W CDi
hen Does the
Once a departure is activated, the Course Deviation Indicator (CDI) full scale deflection is set to 0.3 nm. The
CDI scale changes to 1.0 nm (terminal mode) then ramps up to 2.0 nm (enroute mode) at 30 nm from the
departure airport. When 31 nm from the destination, the CDI scale smoothly transition from 2.0 nm back
to 1.0 nm (terminal mode). At 2.0 nm before the FAF during an active approach, the CDI scale transitions
down further based on the type of approach activated (LNAV, LNAV/VNAV, LPV). When a missed approach is
activated, the CDI is set to 0.3 nm. See the Flight Instruments Section for more details on CDI scaling.
190-02692-00 Rev. A
• Manual sequencing - 'holds' on selected waypoint
• Manually select course to waypoint from HSI
• Indicates 'TO' or 'FROM' waypoint
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sCale ChanGe
Garmin G1000 Pilot's Guide for the Piper PA-32 Saratoga
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a DePartUre or an arrival
APPENDIX D
OBS
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