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Gorgo said..
Buy an Apple watch series 3. Waterproofing problems solved and it's on your wrist the whole time. No need to cart your phone with you. Wifey can "Find My iPhone" to see where you are using the Family feature.
You can record your paddle as well, but that starts to chew into the battery life if you want it for emergency contact as well.
If you get an Apple watch 3, make sure to get the Nike sport version with velcro strap. The standard strap comes off too easy. The phone works well but I did add Paddle Loger app for distance accuracy . Plus I've got credit card with Apple pay and loyalty cards.
My wife fell off in the creek and ruined her iphone with an Overboard bag. Bag was tightly closed but enough water got in to damage the phone.