Really efficient alternative: "gps4cam" app for a few euros: GPS Tragger on the smartphone runs on; at the end of the tour, a QR code is generated, photographed and copied with a free, installed on the PC Zusatzgrogamm, along with the images on the PC. The image features now include the GPS data (of course without direction information). So slightly more time. In addition, a GPX file is generated, with which leave the route and the altitude profile on an Internet map. Appearance of faults in positions occurred sporadically, but also works in the car and in buildings. Small drawback: the smallest interval of position fixes is 30 seconds.