Hi, I was thinking on buying a Coros Apex 2 pro watch for speedwindsurfing, but noticed Coros downgraded the water rating from the previous Apex Pro from 10 to 5 ATM on the current Apex 2 Pro.... everywhere I have checked states 5 ATM rating is not safe for watersports, and recommend at least 10 ATM... so the only option would be the Vertex 2, which is older, a lot more expensive and an overkill just for windsurfing. Guess I'm staying with my GT31 for now and hope Coros next Apex watch is 10 ATM again. 

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