Hello all
On epsg.io/map#srs=4326&x=6.030174&y=49.955030&z=17 you can "transform" the coordinates to the needed x,y values to center your map.
Put this in your article:
{gpxtrackmap}test.gpx,dl=0,center_x=670751.70,center_y=6438194.95,zoomlevel=15,tpl=3{/gpxtrackmap}
And Kautenbach is the middle of your map:
kautenbach.mirger.nl/
Or on Texel: texel.mirger.nl
Please make first a good backup of your gpxtrackmap.php before using my adjustments!!!
Allthough I think it is working correctly, you will use it on your own responsibility!
Warning: this is just the file gpxtrackmap.php. It is not an update!
If you do not know what you have to do, wait till Frank has time to make an update file!!!
Have a good time!