The best solution is a good marine GPS unit. It will have options to plot your course and give you elapsed distances. I don't own one myself, but many of the people I paddle with do...and it's fascinating to see how many miles are added just bouncing back and forth across the missouri or the mississippi during a putatively 20 mile jaunt.
Just remember, even if it claims to be water proof, a clear drybag is your friend...why put "water proof" to the test if you don't have to?
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The best solution is a good marine GPS unit. It will have options to plot your course and give you elapsed distances. I don't own one myself, but many of the people I paddle with do...and it's fascinating to see how many miles are added just bouncing back and forth across the missouri or the mississippi during a putatively 20 mile jaunt.
Just remember, even if it claims to be water proof, a clear drybag is your friend...why put "water proof" to the test if you don't have to?