
Cirrus Perspective
™
by Garmin – Cockpit Reference Guide for the SR20/SR22/SR22T
190-00821-09 Rev. A 115
Abnormal Operation
Flight
Instruments EIS
Nav/Com/
XPDR/Audio AFCS GPS Nav
Flight
Planning Procedures
Hazard
Avoidance
Additional
Features
Abnormal
Operation
Annun/
Alerts Appendix Index
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 fields 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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