Things that I find important about a wearable device in relation to kitesurfing:
- Strong and robust
- Waterproof including salt sea water
- GPS tracking without mobile telephone
- Continuous heart rate monitoring
- Operate my GoPro
- Measure the jumps (heights)
I think that a Garmin Fenix 5X will do the trick, so I putted it on my wishlist and will buy it when it is available.