Keep an eye open for the "Federales" !!!
Seems as soon as you cross the border line waters you need an VHF owners license as well as an operators license!!
Just more ways to get money from you.! Also make sure you dont have any fishing tackle aboard;not even a piece of line with a hook on it!
Otherwise they want to see your Mexican waters fishing license also.
And not wanting to suggest any ideas of corruption; but just like most people leave their cars this side of the border and walk into Tijuana, a lot of my boating friends avoid taking their boats south.(Insurance issues )
So ,get that Ribcraft ready to roll (not sure what they chase you with down there!
But as the Coranados are a great dive location(been their on several charter dives) you can download the VHF application forms quite easily (and no exam required)
Best to pay your money and be safe!