@ Turboccc,
Mate I'm way out of my depth but I just converted a camera gpi file to gpx and found xmlns:gpxtpx="http://www.garmin.com/xmlschemas/TrackPointExtension/v1" in it. I've never seen this in any file's I have played with before but it could possibly reference to <gpxtpx:course>138.35</gpxtpx:course> in my last post in aid of directional poi or bearings

Paul