On imporvement could be to send each XX min a SMS with your current position. It would be better than using 4G when you are in an area with a network poor coverage.
Thanks
Yes, that would be very useful in regions with unreliable network.
For example I plan to do hiking tours on Tenerife, alone. In many regions there isn't any network deep in the forest.
So with an every-10-min-sms (or every-1-km-sms) I could provide the best possible GPS tracking to my wife (waiting at the hotel) automatically.