Garmin GNC 420W Pilots Guide - Page 87

SECTION 6 PROCEDURES Another Procedures Page option allows the pilot to activate the final course segment of the approach. This option assumes the pilot will receive vectors to the final approach fix (FAF) and provides guidance to intercept the final course, before reaching the FAF. Activating the approach, with vectors to final: 1) Press the PROC Key to display the Procedures Page. 2) Turn the large right knob to highlight 'Activate Vector-To-Final?' (Figure 6-7) and press the ENT Key. Figure 6-7 Procedures Page 3) A confirmation widow will appear (Figure 6-7). With 'Yes?' highlighted, press the ENT Key. In many cases, it may be easiest to 'Load' the full approach while still some distance away, enroute to the destination airport. Later, if vectored to final, use the steps above to select 'Activate Vector-To-Final'-which makes the inbound course to the FAF waypoint active. Otherwise, activate the full approach using the 'Activate Approach?' option. 6.2 Non-Precision Approach Operations The GNC 420 provides non-precision approach guidance using its built-in GPS receiver. The GPS receiver can also be used as a supplemental aid for precision approaches, but external localizer and glideslope receivers must be used for primary approach course guidance. Approaches designed specifically for GPS are often very simple and don't require overflying a VOR or NDB. Many non-precision approaches have 'GPS overlays' to let the pilot fly an existing procedure (VOR, VOR/DME, NDB, RNAV, etc.) more accurately using GPS. Many overlay approaches are complex (in comparison to GPS-only approaches). The GNC 420 displays and guides the pilot through each leg of the approach, automatically sequencing through each of these legs, up to the missed approach point (MAP). Approaches may be flown 'as published' with the full transition using any published feeder route or initial approach fix (IAF), or may be flown with a vectors-to-final transition. NOTE: The following approach examples are intended for instructional use only and are not to be used for navigation. 190-00140-20 Rev. K GNC 420(A) Pilot's Guide and Reference 6-3