Garmin GNC 420W Pilots Guide - Page 183

SECTION 10 TERRAIN 10.2 TERRAIN Page See Section 3.5 for a complete description of the TERRAIN Page and its operation. TERRAIN Symbols NOTE: If an obstacle and the projected flight path of the aircraft intersect, the display automatically zooms in to the closest potential point of impact on the TERRAIN Page. The symbols and colors in Figure 10-1 and Table 10-1 are used to represent obstacles and potential impact points on the TERRAIN Page. TERRAIN uses yellow (caution) and red (warning) to depict terrain information relative to aircraft altitude. Each color is associated with an alert severity level. Terrain graphics and visual annunciations also use these color assignments. 100 ft Threshold Projected Flight Path Unlighted Obstacle Potential Impact Point Terrain above or within 100 ft below the aircraft altitude (Red) 1000 ft Terrain between 100 ft and 1000 ft below the aircraft altitude (Yellow) Terrain more than 1000 ft below the aircraft altitude (Black) Figure 10-1 Terrain Altitude/Color Correlation Obstacle Symbol Unlighted Obstacle < 1000' > 1000' AGL AGL Lighted Obstacle < 1000' > 1000' AGL AGL Potential Impact Points Obstacle Location Obstacle above or within 100' below current aircraft altitude Obstacle between 100' and 1000' below current aircraft altitude Table 10-1 Terrain/Obstacle Colors and Symbology Alert Level WARNING (Red) CAUTION (Yellow) 190-00140-20 Rev. K GNC 420(A) Pilot's Guide and Reference 10-3