Pilot's Guide

Garmin G1000 Pilot’s Guide for the Cessna Corvalis/Corvalis TT
190-00552-05 Rev. A
SYSTEM
OVERVIEW
FLIGHT
INSTRUMENTS
EIS
AUDIO PANEL
& CNS
FLIGHT
MANAGEMENT
HAZARD
AVOIDANCE
AFCS
ADDITIONAL
FEATURES
APPENDICESINDEX
324
HAZARD AVOIDANCE
6.3 TERRAIN PROXIMITY
WARNING: Do not use Terrain Proximity information for primary terrain avoidance. Terrain Proximity is
intended only to enhance situational awareness.
NOTE: Terrain data is not displayed when the aircraft is outside of the terrain database coverage area.
G1000TerrainProximityis aterrain awarenesssystemthat doesnotcomplywithTSO-C151b certication
standards.Itincreasessituationalawarenessandaidsinreducingcontrolledightintoterrain(CFIT).Donot
confuseTerrainProximitywiththeoptionalTerrainAwarenessandWarningSystem-ClassB(TAWS-B).TAWS-B
ismoresophisticatedandrobust,anditisTSO-C151bcertied.TerrainProximitydoesnotprovidewarning
annunciationsorvoicealerts.Itonlyprovidescolorindicationsonmapdisplayswhenterrainandobstaclesare
withinacertainaltitudethresholdfromtheaircraft.Althoughtheterrainandobstaclecolormapdisplaysarethe
same,TAWS-Busesmoresophisticatedalgorithmstoassessaircraftdistancefromterrainandobstacles.
TerrainProximityrequiresthefollowingcomponentstooperateproperly:
•Valid3-DGPSposition
•Validterrain/obstacledatabase
TerrainProximitydisplaysaltitudesofterrainandobstructionsrelativetotheaircraftpositionandaltitudewith
referencetoadatabasethatmaycontaininaccuracies.Terrainandobstructionsareshownonlyiftheyareinthe
database.Terrainandobstacleinformationshouldbeusedasanaidtosituationalawareness.Theyshouldnever
be used to navigate or maneuver around terrain.
Note that all obstructions may not be available in the terrain and obstacle database. No terrain and obstacle
informationisshownwithoutavalid3-DGPSposition.
TheG1000GPSreceiverprovidesthehorizontalpositionandaltitude.GPSaltitudeisderivedfromsatellite
position.GPSaltitudeisthenconvertedtotheheightabovegeodeticsealevel(GSL),whichistheheightabove
meansealevelcalculatedgeometrically.GSLaltitudeisusedtodetermineterrainandobstacleproximity.GSL
altitude accuracy is affected by satellite geometry, but is not subject to variations in pressure and temperature that
normallyaffectpressurealtitudesensors.GSLaltitudedoesnotrequirelocalaltimetersettingstodetermineMSL
altitude.Itisawidely-usedMSLaltitudesource.
TerrainandobstacledatabasesarereferencedtoMSL.UsingtheGPSpositionandaltitude,theTerrainProximity
featureportraysa2-Dpictureofthesurroundingterrainandobstaclesrelativetothepositionandaltitudeofthe
aircraft.GPSpositionandGSLaltitudeareusedtocalculateandpredicttheaircraft’sightpathinrelationto
thesurroundingterrainandobstacles.Inthisway,thepilotcanviewpredicteddangerousterrainandobstacle
conditions.
DISPLAYING TERRAIN PROXIMITY INFORMATION
ThesymbolsandcolorsinFigure6-58andTable6-5areusedtorepresentobstaclesandaircraftaltitude
when the Terrain Proximity Page is selected for display.  Terrain Proximity uses black, yellow, and red to
representterrain information relativeto aircraft altitude. The color of each obstacle is associated with the
altitude of the aircraft.