forum.openstreetmap.org/viewtopic.php?id=69500&p=2
www.magicmaps.de/gnss-wissen/praezise-gps-messungen-mit-hilfe-von-dgps-und-rtk/?L=0
OSMand iphone tracking
Geoidhöhen-Berechner
Garmin FAQ / Waypoints via gpsbabel
Garmin 60csx Track rename
#!/usr/bin/perl -w
foreach (<*.gpx>) {
$date = substr($_,0,8);
$date = $date . “0000”;
`touch -amt $date $_`;
}