I kayak and paddleboard with my watch. I bought a waterproof case for my S0, but don't use that anymore now that I have a S3. I like it for exactly the reasons you mention, I can get and make texts with the phone in a waterproof case (and the occasional phone call). I use WorkOutDoors to track my route and that gives tons of stats about your paddling.
To me, the main issue is each paddle stroke will trigger "raise to wake" which is annoying and can drain your battery. I use Theater mode, and click notifications back on, so that just then turns off raise to wake. I have long thought about asking the developer of WorkOutDoors if it would be possible to have a kayak or paddle mode setting.
Because of the ability to call 911, I will always buy the cellular option, but don't activate it. The ability to call 911 has been long discussed here, back to the S0 when some folks tested that. For kayaking, one of the risks is losing your boat, say you go overboard in heavy waves and wind, and your boat floats away faster than you can swim. Or your boat sinks, or you drop or lose or forget your phone. You can still call 911 with the watch while floating in your PFD (which you are wearing).
To me, the main issue is each paddle stroke will trigger "raise to wake" which is annoying and can drain your battery. I use Theater mode, and click notifications back on, so that just then turns off raise to wake. I have long thought about asking the developer of WorkOutDoors if it would be possible to have a kayak or paddle mode setting.
Because of the ability to call 911, I will always buy the cellular option, but don't activate it. The ability to call 911 has been long discussed here, back to the S0 when some folks tested that. For kayaking, one of the risks is losing your boat, say you go overboard in heavy waves and wind, and your boat floats away faster than you can swim. Or your boat sinks, or you drop or lose or forget your phone. You can still call 911 with the watch while floating in your PFD (which you are wearing).