indeed very useful, however I may be thick, but I cannot figure out how it works and what it charges you.
It DOES pick up signal from GPS satelites = FREE
it DOES communicate with you via cell phone tech. 2G, 3G, whatever = NOT free
how does it do it without a sim?
Hardcoded to a service provided by garmin and charging $ per year?
How does it work if you buy in UK and use it elsewhere?