Gps can be fooled: pass the device on. There are other methods, but harder to do if tge device isn't yours. Video/ photo every xkm would be better. Especially

Gps can be fooled: pass the device on. There are other methods, but harder to do if tge device isn't yours. Video/ photo every xkm would be better. Especially as eta (at a checkpoint) can be fairly accurately er...estimated.