No disrespect to TimeWaster. But reading the original post, you realise cycling today is a world away from cycling around the council estates in the 70s. It was also a lot cheaper then and probably more fun.
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I was born early 70s and learnt to ride in the 70s. My son is 12 yo now and learnt just how I did. In fact he was riding his bike early on in primary school while his friends were learning to ride in classes for that. While they were struggling (as in all in his year) he was riding past standing on his top tube or standing on his saddle steering with one foot on the bars!! Do not think that I am kidding!! That was what he got told off for and sent to ride at the other end of the large playground to where the classes were going off. His classmates told us he was sent to the naughty boy's part of the playground. A few later joined him but he was the only one to do tricks at that age.
My point being is that times do not change that much. Kids still do stupid things and still get up and carries on when it goes wrong. My son a year later fell off his bike and while he did cry, he got back up and rode off. He was not using one arm properly and we thought he had broken his collarbone as my partner had years earlier. She said that he was holding his arm the same way. Anyway, he lifted his arm up and moved it all despite the pain so we thought it was just a bad fall and he was sore. We went home via the nice chippy and after he had finished his dinner we realised he was hurt more than we thought. Turns out it was a broken elbow!! You just carry on when you are hurt now as back when I was a kid. Not all are mollycoddled these days, nor would stand for it!!
However we live in the country and having a location for an accident is worth the spend on a helmet based crash sensor (different from the gps, watch or phone versions in performance from what I have read). Whether we end up doing anything if it goes off is another matter. We have life360 on his phone so if he's moving after an accident alert we will probably at most call him to check whether he is ok (or more likely send a message from the life360 app (uses the text message app but easier to do that from the tracking app when it is being used anyway).
Does anyone have any experience of using one of the helmet based sensors? It seems the replies are about Garmin crash sensors with their GPS units not with the helmet sensors. I doubt we would get a GPS unit as the helmet ones are so much cheaper and work better for their one intended use.