3-88 Pilot’s Guide 190-02327-03 Rev. C
Navigation
Dead Reckoning
WARNING
Do not use projected position data as the only means of navigation.
When dead reckoning mode is active:
• System flags all external outputs dependent upon GPS position data
• Map reports “No GPS Position”; overlays are not available
• “DR” appears over the ownship icon
• DR mode annunciation replaces ENR or OCN
• Terrain functionality is not available
• Traffic and Stormscope data display on their respective pages only
• CDI is not available
Points About Dead Reckoning
• Provides limited navigation using the last known position and speed following
the loss of GPS navigation while on an active flight plan
• Becomes active after a loss of GPS position while navigating using an active
flight plan and the flight phase is either En Route or Oceanic
• Allowed only during en route and oceanic phases of flight
Dead Reckoning Mode, GTN 650Xi
Dead reckoning
mode ends once
GPS position is
restored.
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