I have an app called Cyclemeter that uses GPS for tracking mileage, time and routes for cycling. However, you can set it record other activities, such hiking, running and paddling. Anyway, it's a good way to find out how far you paddled, your time, average pace and map your route.
When carrying my iPhone while paddling (or cycling), I keep it in a waterproof bag in my PFD vest pocket (zipped). Occasionally I use it to take photos as well, but I'm always paranoid about dropping it in the water, so I don't do that a lot.
PFD's (Life Jackets)
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