Off skiing in a couple of weeks. DS7 is naught adventurous and last year went off looking for me. Luckily the teacher saw him and pulled him back to class. So I'm a bit worried and anxious. Thinking of buying a GPS tracker or watch. Is that a bit bloody OTT? Has anyone else bought one? Looking at reviews on Amazon they seem to be really unreliable so don't want to get stung for a crap bit of kit either!