- Taken the watch on hiking, camping, sailing and RV trips
- Swam in hot springs, cold water, sea water (both pool and open water)
- Taken the watch cycling, sailing, tubing, and everything short of a scuba dive
By the way, here's why battery life is important: not only does the battery life needs to be long enough to be worn 24-hours/day in order to get sleep tracking data, it's also important as a measure of longevity. Modern lithium batteries are normally rated for 300 charge cycles before the charge capacity drops by 20%. If your battery's going to barely last the day, then within a year, the charge capacity is going to be degraded to the point where it won't last the day. A battery that goes a week between charges, by contrast, can easily go 5 years before the charge capacity is degraded, and even then it's a degradation from 7 days to 5 days or so. In other words, a battery that barely lasts a day is a built-in obsolescence machine, while the battery that lasts a week is designed to actually be useful for a significant lifespan.
- While driving, the device continues to tracks steps. There needs to be a "driving mode" that ignores steps, but then I'd forget to turn it off.
- While on a sailboat, my walking patterns change and the device doesn't always register steps. (No big deal, though the "move!" alarm does get annoying)
- The calories reading is laughably low. This is not a problem for me since I mostly ignore it and go with "how I feel" as far as eating is concerned. But if you're a pro Athlete weighing your food before you eat it, you probably want more accuracy.
- Barometric pressure/air temperature sensor (I'd be OK with an external sensor like the Tempe)
- A tide-table/app would be really useful for when I'm sailing in tidal regions.