Garmin GTN 750 Cockpit Reference Guide - Page 57

Message Description Action TRAFFICTraffic device has been in standby for more than 60 seconds. The GTN is airborne and Set the traffic device to the traffic device has "operate" on the traffic page been in standby for more if traffic alerts are desired. than 60 seconds. TRANSPONDERTransponder 1 and 2 Mode S addresses do not match. The GTN is configured Contact dealer for service. for two transponders and their Mode S addresses do not match. This message is intended to assist installers and will not occur in a properly configured system. TRANSPONDER 1 OR 2- The transponder is Verify squawk code and Transponder 1 or 2 reporting to the GTN altitude with ATC. Contact needs service. that it needs service. dealer for service. The transponder may continue to function. TRANSPONDER 1 OR 2 Transponder 1 or 2 is inoperative or connection to GTN is lost. The GTN is configured for transponder 1 or 2 but is not able to communicate with the transponder. Verify squawk code and altitude with ATC. Contact dealer for service. TRUE NORTH APPROACHVerify NAV Angles are referenced to True North (T). A procedure is loaded Verify the NAV Angle is set to that is referenced to true True North. north and the active leg has a published true north reference. 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. Messages 190-01007-04 Rev. B GTN 725/750 Cockpit Reference Guide (CRG) 51