Last Friday DS1 went to play at a friend's house. As he was leaving I reminded him to take a watch, so he could make sure he was back on time. he did, but it was only much later that I realised the watch he had "forgotten" to bring home was my Garmin GPS watch for running. He has been dealt with!
DS1 went to get it back on Sunday, but it couldn't be found until today. His friend has clearly been having lots of fun with it, all my settings have been changed
(technophobe, it will take me ages to put them right
) including changing the user details to his (DS's friends's) birthday and weight.
The watch records all distances covered, the speed and the time. It has been used a lot, but one of the "runs" was 1.3 miles at 12:35 on Saturday morning!