Garmin GNC 420W Pilots Guide - Page 49

SECTION 3 NAV PAGES 3.5 TERRAIN Page NOTE: The TERRAIN Page does not appear on GNC 420 units that are not properly equipped with or configured for TERRAIN. See Section 9 for a full description of TERRAIN functions. Red Terrain (Warning - Terrain Above or Within 100' Below Aircraft Altitude) Heading Indicator GPS-derived MSL Altitude TERRAIN Page To display the TERRAIN Page, select the NAV Page Group and turn the small right knob until the TERRAIN Page is displayed (Figure 3-26 and 3-27). The TERRAIN Page displays: • GPS-derived MSL altitude shown in increments of 20 feet or 10 meters, depending on unit configuration. The 'G' to right of the MSL altitude display reminds the pilot that altitude is GPS-derived. • Aircraft ground track • Terrain Range - Indicates the terrain elevation in colors relative to the aircraft altitude • Range marking rings - (1 nm, 2 nm, 5 nm, 10 nm, 25 nm, 50nm, and 100 nm) • Heading Indicator - The heading indication on the TERRAIN Page always displays 'TRK' for Trackup, unless there is no valid heading • Obstacles • Potential Impact Points Position of Current Page within Current Page Group Current Page Group Number of Pages in Current Page Group Figure 3-26 TERRAIN Page 120˚ View Yellow Terrain (Caution Black Terrain (No Danger - Terrain Between 100' - Terrain More than and 1000' Below Aircraft 1000' Below Aircraft Altitude) Altitude) Range Marking Ring Figure 3-27 TERRAIN Page 360˚ View Selectable Display Settings The TERRAIN Page has two selectable view settings: • 360˚ View - View from above aircraft depicting surrounding terrain on all sides • 120˚ View - View of terrain ahead of and 60˚ to either side of the aircraft flight path (Figure 3-27) NOTE: The TERRAIN Page gives a 'Track Up' display orientation, as indicated by the 'TRK' label shown on the display. This is the only orientation available on this page. 190-00140-20 Rev. K GNC 420(A) Pilot's Guide and Reference 3-15