Garmin GTN 750 Cockpit Reference Guide - Page 58
service. The NAV
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Message Description Action VERTICAL CALCULATORApproaching target altitude. User has configured a vertical descent calculation, and the aircraft is approaching the target altitude. No action is necessary; message is informational only. VLOC RECEIVERNavigation receiver needs service. The NAV radio is reporting that it needs service. The NAV radio may continue to function. Use GPS based navigation. Contact dealer for service. VLOC RECEIVER- The NAV radio is not Use GPS based navigation. Navigation receiver has communicating property Contact dealer for service. failed. with the system. WAYPOINTArriving at [wpt name]. User has configured the arrival alarm and is within the specified distance. No action is necessary; message is informational only. NOTE 1: There are several reference datums that waypoints can be surveyed against. TSO-C146 normally requires that all waypoints be referenced to the WGS84 datum, but allows for navigation to waypoints that are not referenced to the WGS84 datum so long as the pilot is notified. Certain waypoints in the navigation database are not referenced to the WGS84 datum, or their reference datum is. Messages 52 GTN 725/750 Cockpit Reference Guide (CRG) 190-01007-04 Rev. B