Garmin GNC 420W Pilot's Manual Addendum

Also see for GDL 69: Pilot's guide addendum Pilot's guide addendum Activation Instructions Pilot's guide Activation Instructions

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Garmin GNC 420W Pilot's Manual Addendum Manual pdf 34 page image

30Part Three: Section 2TAWS Operationlapse rates have fixed values), it is common for thebaro-corrected altitude (as read from the altimeter)to differ from the GPS-MSL altitude. This variationresults in the aircraft’s true altitude differing from thebaro-corrected altitude.Power UpDuring power-up of the 500W Series unit, theterrain/obstacle database versions are displayed alongwith a disclaimer to the pilot. At the same time,TAWS self-test begins. TAWS gives the following auralmessages upon test completion:• “TAWS System Test, OK”, if the system passes the test• “TAWS System Failure”, if the system fails the testA test failure is also annunciated for TAWS, asshown in the TAWS Alert Summary table.TAWS PageThe TAWS Page is in the NAV group of pages (seethe 500W Series Pilot’s Guide for detailed informationregarding page groups and pages).The TAWS PageTo display the TAWS Page, select the NAV groupand turn the small right knob until the TAWS Pageis displayed. Terrain information, aircraft groundtrack, and GPS-derived MSL altitude are displayedon the page. Altitude is shown in increments of 20feet or in increments of 10 meters, depending on unitconfiguration. The “G” to right of the MSL altitudedisplay reminds the pilot that altitude is GPS-derived.The TAWS Page has two selectable view settings:120˚ Viewing Angle on the TAWS Page•360˚ View—View from above aircraft depictingsurrounding terrain on all sides•120˚ View—View of terrain ahead of and 60˚ toeither side of the aircraft flight pathNOTE: The TAWS Page gives a “Track Up” displayorientation, as indicated by the “TRK” label shown onthe display. This is the only orientation available for theTAWS Page.To display a 120˚ view:1. Select the TAWS Page and press MENU. Select“View 120˚?”.2. Press ENT. The TAWS Page displays the 120˚view. To change to a 360˚ view, repeat step 1,select “View 360˚?”, and press ENT.Seven display ranges are available, allowing for amore complete view of the surrounding area.