file type	format
.cup		Seeyou Waypoint file
.da4		LX Waypoint file
.att		LX4000 Waypoint file
.wpz		Zander Waypoint file
.dat		Cambridge Waypoint file
.dbt		Volkslogger Waypoint file
.cdb		Cenfis Waypoint file
.wht		Westerboer Waypoint file
.grw		Print Technik Waypoint file
.gpx		GPS eXchange Format file
.cupx		Seeyou Extended Waypoint file
.json		Seeyou JSON Waypoint file