Garmin G1000 Reference Manual

Also see for Cessna Caravan G1000: Cockpit reference guide Pilot's guide Pilot's guide Pilot's guide Pilot's guide

Contents

Garmin G1000 Reference Manual Manual pdf 77 page image

Garmin G1000 Cockpit Reference Guide for the Cessna Caravan190-00748-02 Rev. B 61abnormal operationFlightInstruments EISNav/Com/XPDR/Audio AFCS GPS NavFlightPlanning ProceduresHazardAvoidanceAdditionalFeaturesAbnormalOperationAnnun/Alerts Appendix Indexdead reCkoningWhile in Enroute or Oceanic phase of flight, if the G1000 detects an invalid GPSsolution or is unable to calculate a GPS position, the system automatically reverts toDead Reckoning (DR) Mode. In DR Mode, the G1000 uses its last-known positioncombined with continuously updated airspeed and heading data (when available) tocalculate and display the aircraft’s current estimated position.NOTE: Dead Reckoning Mode only functions in Enroute (ENR) or Oceanic(OCN) phase of flight. In all other phases, an invalid GPS solution producesa “NO GPS POSITION” annunciation on the map and the G1000 stopsnavigating in GPS Mode.DR Mode is indicated on the G1000 by the appearance of the letters ‘DR’superimposed in yellow over the ‘own aircraft’ symbol as shown in the followingfigure. In addition, ‘DR’ is prominently displayed, also in yellow, on the hSI slightlyabove and to the right of the aircraft symbol on the CDI as shown in the followingfigure. The CDI deviation bar is displayed in yellow, but will be removed from thedisplay after 20 minutes. Lastly, but at the same time, a ‘GPS NAV LOST’ alert messageappears on the PFD.Normal navigation using GPS/WAAS source data resumes automatically once avalid GPS solution is restored.It is important to note that estimated navigation data supplied by the G1000 inDR Mode may become increasingly unreliable and must not be used as a sole meansof navigation. If, while in DR Mode, airspeed and/or heading data is also lost ornot available, the DR function may not be capable of estimating your position and,consequently, the system may display a path that is different than the actual movementof the aircraft. Estimated position information displayed by the G1000 throughDR while there is no heading and/or airspeed data available should not be used fornavigation.DR Mode is inherently less accurate than the standard GPS/WAAS Mode due to thelack of satellite measurements needed to determine a position. Changes in wind speedand/or wind direction compounds the relative inaccuracy of DR Mode. Because of thisdegraded accuracy, the crew must maintain position awareness using other navigationequipment until GPS-derived position data is restored.