Garmin Software Version 0767.15 Podręcznik Użytkownika Strona 81

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Garmin G1000 Cockpit Reference Guide for the Cessna Caravan
190-00748-05 Rev. A 63
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
WhileinEnrouteorOceanicphaseofight,iftheG1000detectsaninvalidGPS
solutionorisunabletocalculateaGPSposition,thesystemautomaticallyrevertsto
DeadReckoning(DR)Mode.InDRMode,theG1000usesitslast-knownposition
combinedwithcontinuouslyupdatedairspeedandheadingdata(whenavailable)to
calculate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 produces
a “NO GPS POSITION” annunciation on the map and the G1000 stops
navigating 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 following
gure.Inaddition,‘DR’isprominentlydisplayed,alsoinyellow,ontheHSIslightly
aboveandtotherightoftheaircraftsymbolontheCDIasshowninthefollowing
gure.TheCDIdeviationbarisdisplayedinyellow,butwillberemovedfromthe
displayafter20minutes.Lastly,butatthesametime,a‘GPSNAVLOST’alertmessage
appearsonthePFD.
NormalnavigationusingGPS/SBASsourcedataresumesautomaticallyonceavalid
GPSsolutionisrestored.
ItisimportanttonotethatestimatednavigationdatasuppliedbytheG1000in
DRModemaybecomeincreasinglyunreliableandmustnotbeusedasasolemeans
of navigation. If, while in DR Mode, airspeed and/or heading data is also lost or
not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movement
of the aircraft. Estimated position information displayed by the G1000 through
DRwhilethereisnoheadingand/orairspeeddataavailableshouldnotbeusedfor
navigation.
DRModeisinherentlylessaccuratethanthestandardGPS/SBASModeduetothe
lackofsatellitemeasurementsneededtodetermineaposition.Changesinwindspeed
and/orwinddirectioncompoundstherelativeinaccuracyofDRMode.Becauseofthis
degradedaccuracy,thecrewmustmaintainpositionawarenessusingothernavigation
equipmentuntilGPS-derivedpositiondataisrestored.
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