If you elect to register, a good decision by the way, another requirement is to have the registration aboard which can become a bit of a challenge in an open boat. The good news is that boat registrations have a cut-out portion (lower left as I recall) which you can keep in your wallet.
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Remember to immediately record your catch or you may become the catch!

It's the person who has done nothing who is sure nothing can be done. (Ewing)