I have a single screen AF-5600 system running ver 12.3.3 connected to a GTN 650. What is the function of the Map / ApPlt button? Today I was flying with a destination set on the 650 and properly reflected on the 5600. When I selected Map > ApPlt a totally different airport was presented. The airport presented happened to be a bit closer than the destination but it was not in the flight plan.