Garmin GTN 750 Pilot's Guide - Page 39
Dead Reckoning
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1.10 Dead Reckoning Dead reckoning is a feature that enables the GTN to provide limited navigation using the last known position and speed after a loss of GPS navigation while on an active flight plan. CAUTION: Navigation using dead reckoning is only an estimate and should not be used as the sole means of navigation. Use other means of navigation, if possible. Foreword Getting Started Audio & Xpdr Ctrl Com/Nav Dead reckoning becomes active after a loss of GPS position while navigating FPL using an active flight plan and the flight phase is either En Route (ENR) or Oceanic (OCN). Direct-To "DR" will be overlayed on the ownship icon. The To/From flag is removed Proc from the CDI. The Dead Reckoning annunciator (DR) appears on the lower left side of the map display and will replace ENR or OCN when a GPS position Charts is unavailable and the unit is in Dead Reckoning mode. All external outputs dependent on GPS position are flagged. Wpt Info Terrain will be noted as not available and new terrain advisory pop-ups will Map not occur. Traffic and StormScope information will not be shown on the Map page, but will continue to be available on their own dedicated pages. XM weather Traffic will still be available on the Map page. Dead Reckoning mode will continue until GPS position is restored, when GPS Terrain navigation is restored Dead Reckoning mode is exited. The DR annunciations will be removed and GPS information will be used to compute navigation related Weather information for the current flight phase. Nearest Dead Reckoning is only allowed in En Route and Oceanic phases of flight. If the unit is in a Terminal or Approach phase of flight when Dead Reckoning Music takes place, "No GPS Position" will be displayed on the map pages and all navigation data will be dashed. If you are operating in Dead Reckoning mode Utilities and a transition to Terminal or Approach phases of flight would occur from the projected Dead Reckoning position, Dead Reckoning mode will be discontinued. System "No GPS Position" will be displayed on the map pages and all navigation data will be dashed. Messages Symbols Appendix 190-01007-03 Rev. B Garmin GTN 725/750 Pilot's Guide 1-19 Index