I've often thought about getting a Spot for myself for when I'm about and about and when I go on my camping trips. But I tend to be in cell range in most situations so I have always decided against it as I have my cell phone on me at all times and I also carry a backup battery as well to recharge my cell phone and other devices when not near my bike or car.I know done people don't like the idea but I know I'd feel a lot better with a GPS tracker on board. Get him a spot or something similar so you can use the threat of not being able to ride if he goes over the speed limit(within reason) or goes else where he shouldn't.
And if god forbid he gets in a crash he can use the sos feature on the spot. There are other brands out there so do your own research but I think it'll be a way to give you peace of mind and force safe habits on him.
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