The automatic logging was also tested by calling the
device with another mobile phone, which blocks the
GPRS connection. When ending the track, an alert
message was displayed showing that there were records in
the Recordstore, later tested on the recorded track.
The accuracy of the GPS position varies from place
to place, but the difference was rather small for such a
low-cost system. It actually matched the accuracy of
Instamapper and the real track. Any user could get a clear
overview where the device has been with the system.
There was no big difference in the order of hundred
meters at all, unless the device is in a building.