Garmin GNC 420W Pilots Guide - Page 218

SECTION 11 ADDITIONAL FEATURES NOTE: Textual METARs can only be requested by identifier or by flight plan (if the flight plan contains a METAR station identifier). • Center - This field allows the pilot to specify reference points for the request. The following five options are available for the 'Center' field: ♦ Current Position - Request METAR data from the aircraft's current position. ♦ Look Ahead - Request METAR data ahead of (along) the current route. ♦ From ID - Request NEXRAD data from a specific waypoint identifier. If 'From ID' is selected as the reference point for the request, the 'WPT' field is displayed (in place of 'Position'). The 'WPT' field is used to enter a waypoint identifier as the reference point for the request. ♦ From Lat/Lon - Request NEXRAD data from a specific latitude and longitude. This is only selectable when requesting from the map. The 'Position' field displays the position of the map cursor and cannot be edited. ♦ From Flight Plan - Request METAR data from one of the waypoints in the active flight plan. This is only selectable when an active Flight Plan has been selected. The 'Flight Plan' field (displayed in place of 'Position') is used to select which waypoint in the active flight plan to use as the reference point for the request. • Radius (Graphical requests only) - This field selects a request radius from 50 to 250 nm from the selected position. • Position (also WPT or Flight Plan) - 'Current Posn'-Position is current, 'Look Ahead'-Position is look ahead position. 'From ID'-Position is from the ID entered into the WPT field. 'Flight Plan' is the ID selected from the active flight plan. • Auto Request (GDL 49 Only) - This field is used to set the time interval for the GDL 49 to automatically send a NEXRAD data request. The time options are OFF, 10 min, 15 min, 20 min, 30 min, 45 min, and 1 hour. When an auto request time is selected, the first request is sent after the specified time has elapsed from when the field was set (as opposed to immediately sending a request). NOTE: It is recommended that the pilot turn the Auto Request function 'on' by setting it to '10 min' updates. This setting provides best performance for the GDL 49. • The 'Manual Send?'(GDL 49) or 'Update Request?' (GDL 69) field is used to request METAR Data. 4) Use the small and large right knobs to select the desired data and the ENT Key to enter the data into the appropriate fields on the METAR Request Page. 5) Select 'Manual Send?' or 'Update Request?' and press the ENT Key. The request has been sent. Note that selecting 'Auto Request' and pressing the ENT Key does not send the request until after the auto time period. 6) To exit from the NEXRAD Request Page, press the small right knob. The Data Link Page is displayed. 11-28 GNC 420(A) Pilot's Guide and Reference 190-00140-20 Rev. K