Like can I just jump in my boat and go? Do I have to alert any authority about my trip? What are the chances the coast guard boards my boat to search it? How do you find a marina in Mexico? Do I have to alert the Mexican government of my trip? I assume I need a passport.
This is to settle a very polite heated discussion between my partner and I. Where neither of us know what we’re talking about.
For finding a marina I expect Google Maps would work fine. It will also allow you to measure distance.