I can’t comment on this specific beacon, but most GPS trackers that I’ve ever had to deal with tend to ping messages off the Iridium satellite network. The devices can cost anywhere from 100-400 quid but you have to pay a subscription for satellite access, plus messages can cost a lot if it’s pinging away frequently.
It’s something I’ve often thought about whilst alone in the far north moor; what happens if a leg goes snap? Crawl miles to get phone reception or pay a significant quantity of cash for an emergency button that maybe I’ll never use?
As for the original topic – I’m not even on 200 yet; that’s because I’m not too interested in numbers. It’s the challenge of an interesting/difficult cache that drives me into the remote moor; I love the place and always have.