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Garmin G950 Cockpit Reference Guide for the Tecnam P2006T

190-01147-01 Rev. A

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G950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G950 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 G950 stops navigating

in GPS Mode.

DRModeisindicatedontheG950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.Also,theCDI

deviationbarisremovedfromthedisplay.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 G950 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G950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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