What phone & ap to use for gps for bike &kayak

in looking for a multi-purpose for kayak & bike gps, it seems that a phone my be the best approach. My question is: What do you all think? Is one phone appreciably better for this? I do realize that a waterproof case is imperative.@

the best water resistance phones are

Samsung Galaxy S7 | Republic Wireless

Samsung Galaxy S7 edge | Republic Wireless

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