Garmin GTN 650 Cockpit Reference Guide - Page 54

Message Description Action VERTICAL CALCULATORApproaching target altitude. Start descent. User has configured a vertical descent calculation, and the aircraft is within 60 seconds of the calculated top of descent. No action is necessary; message is informational only. VERTICAL CALCULATOR Approaching 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 RECEIVER- The NAV radio is Navigation receiver needs reporting that it needs service. 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 48 GTN 625/635/650 Cockpit Reference Guide (CRG) 190-01004-04 Rev. C