Garmin GNC 420(A) Pilot's Manual & Reference

Also see for GNC 420: Instructions Pilot's guide addendum Pilot's guide addendum Pilot's guide addendum Quick reference

Contents

Garmin GNC 420(A) Pilot's Manual & Reference Manual pdf 183 page image

GNC 420(A) Pilot’s Guide and Reference 10-3SECTION 10TERRAIN10.2 TERRAIN PAGESee Section 3.5 for a complete description of theTERRAIN Page and its operation.TERRAIN SymbolsThe symbols and colors in Figure 10-1 and Table10-1 are used to represent obstacles and potentialimpact points on the TERRAIN Page. TERRAINuses yellow (caution) and red (warning) to depictterrain information relative to aircraft altitude.Each color is associated with an alert severity level.Terrain graphics and visual annunciations also usethese color assignments.Potential Impact PointUnlighted ObstacleProjected Flight Path1000 ft100 ft ThresholdTerrain more than 1000 ft below the aircraft altitude (Black)Terrain between 100 ft and 1000 ft below theaircraft altitude (Yellow)Terrain above orwithin 100 ftbelow the aircraftaltitude (Red)Figure 10-1 Terrain Altitude/Color CorrelationUnlighted Obstacle Lighted Obstacle PotentialImpactPoints Obstacle Location Alert Level< 1000’AGL> 1000’AGL< 1000’AGL> 1000’AGLObstacle Symbol Obstacle above or within100’ below current aircraftaltitudeWARNING(Red)Obstacle between 100’ and1000’ below current aircraftaltitudeCAUTION(Yellow)Table 10-1 Terrain/Obstacle Colors and SymbologyNOTe: if an obstacle and the projected flight pathof the aircraft intersect, the display automaticallyzooms in to the closest potential point of impacton the TerraiN Page.190-00140-20 Rev. K