Garmin GNC 420W Pilots Guide - Page 36

SECTION 3 NAV PAGES 3.2 NAV Page Group The NAV Page Group includes seven pages (Figure 3-2). While viewing any NAV page, turn the small right knob to select a different NAV page. The pilot may find this selection process convenient to cycle between the Default NAV Page and the Map Page, two of the most frequently used pages. Other pages are provided for terrain information, (if configured for TERRAIN) to list frequencies for the flight plan, to show the current position, to display current satellite reception, and to make vertical navigation settings. Default NAV Map TERRAIN (if configured) NAV/COM Position Satellite Status VNAV Figure 3-2 NAV Pages NOTE: The NAV Page Group may have eight or nine NAV pages available when the GNC 420 installation includes connection to traffic and/or weather information sources. See Section 11 of this manual for more information. 3.3 Default NAV Page The first NAV page is the Default NAV Page (Figure 3-3). This page may be quickly selected from any page by pressing and holding the CLR Key. Active Leg of Flight Plan TO/FROM Flag Course Deviation Indicator (CDI) Position of Current Page within Current Page Group User-selectable Data Fields Number of Pages in Current Page Group Current Page Group Figure 3-3 Default NAV Page The Default NAV Page displays a graphic course deviation indicator (CDI) across the top of the page. Unlike the angular limits used on a mechanical CDI coupled to a VOR or ILS receiver, full scale limits for this CDI are defined by a GPS-derived distance (0.3, 1.0 or 5.0 nm), as indicated at both ends of the CDI. By default, the CDI scale automatically adjusts to the desired limits based upon the current phase of flight: enroute, terminal area, or approach. The pilot may also manually select the desired scale setting as outlined in Section 9.4. The graphic CDI shows the aircraft's position at the center of the indicator, relative to the desired course (the moving course deviation needle). As with a traditional mechanical CDI, when off course simply steer toward the needle. The TO/FROM arrow in the center of the scale indicates whether the aircraft is heading TO (up arrow) the waypoint or FROM the waypoint (down arrow). 3-2 GNC 420(A) Pilot's Guide and Reference 190-00140-20 Rev. K