A boat is a boat is a boat, Larry. If you're fishing from it, I'd go with yes, a license is in order. But as said above, fear a lightning strike more than actually getting checked for one. To follow up on what Mermaid said, yes... the license follows YOU no matter where or what you're fishing from. I've had to produce mine to fish in tournaments in San Carlos and Mazatlan. No license, no fishy. When stopped by the Navy in Penasco, I offered my fishing license and they couldn't care less. Only wanted to see passport and boat registration -- to which I gave them the TIP (Temporary Import Permit) for my boat.
PESCA does occasionally do spot checks in Penasco, but I haven't seen them there in ages. Their boat is clearly marked.