Garmin SR20 GPS Receiver User Manual


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Cirrus Perspective
®
by Garmin – Cockpit Reference Guide for the SR20/SR22
190-00821-03 Rev. A
68
Abnormal Operation
Flight
InstrumentsEIS
Nav/Com/
XPDR/AudioAFCSGPS Nav
Flight
PlanningProcedures
Hazard
Avoidance
Additional
Features
Abnormal
Operation
Annun/
AlertsAppendixIndex
Dead Reckoning Indications
Symbolic Aircraft
(Map pages and Inset Map)
CDI ‘DR’ Indication on PFD
As a result of operating in DR Mode, all GPS-derived data is computed based upon
an estimated position and is displayed as yellow text on the display to denote degraded
navigation source information. This data includes the following:
• NavigationStatusBoxeldsexceptActiveLeg,TAS,andDTK
• CourseDeviationIndicator
• GPSBearingPointer
• WinddataandpointersintheWindDataBoxonthePFD
• TrackIndicator
• AllBearingPointerDistances
• ActiveFlightPlandistances,bearings,andETEvalues
Also, while the system is in DR Mode, the autopilot will not couple to GPS, and
Terrain Proximity, TERRAIN-SVS, and TAWS are disabled. Additionally, the accuracy
of all nearest information (airports, airspaces, and waypoints) is questionable. Finally,
airspace alerts continue to function, but with degraded accuracy.
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