Garmin GNC 420W Pilots Guide - Page 51

SECTION 3 NAV PAGES Inhibit Mode TERRAIN has an inhibit mode that deactivates the FLTA/PDA visual alerts. Pilots should use discretion when inhibiting TERRAIN and always remember to enable the system when appropriate. See Section 10.3 for more information on TERRAIN alerts. To inhibit TERRAIN: 1) Select the TERRAIN Page and press the MENU Key. 'Inhibit Terrain?' is selected by default (Figure 3-31). TERRAIN Symbols NOTE: See Section 10.2 for a complete description of TERRAIN symbology. The following symbols (Figure 3-33) are used to represent obstacles and potential impact points on the Terrain Page. • Red Symbol - Terrain/Obstacle is above or within 100 feet below the aircraft altitude • Yellow Symbol - Terrain/Obstacle is between 1000 feet and 100 feet below the aircraft altitude • Black Symbol - Terrain/Obstacle is more than 1000 feet below the aircraft altitude NOTE: Obstacle symbols are shown on display zoom ranges up to 10 nm. Figure 3-31 TERRAIN Page Menu 2) Press the ENT Key. The 'TER INHB' annunciation is displayed in the TERRAIN annunciator field when TERRAIN is inhibited (Figure 3-32). Annunciator Field Unlighted Obstacles 1000 feet AGL Potential Impact Points Figure 3-33 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. 190-00140-20 Rev. K GNC 420(A) Pilot's Guide and Reference 3-17