We are from the UK and have a boat
in Mazatlan in the Baja and love it in Mexico. We use C-maps on a B&G chart plotter.
Can I suggest Charlies Charts old fashioned I know, but really good.
Please also note that the electronic charts can be up to a mile and a half out as the waters were charted back in the 18 hundreds.
We have sailed down to Banderas Bay and taken an island to starboard and the chart plotter shows us on the port side of the Island. We had a yacht master with us and he couldn't believe it.
Our old Raymarine
outfit has us on land as we come into Mazatlan in the channel.
Please be careful and have someone on watch all the time.