The map is simply a case of reusing an existing part that basically works, even if not perfectly. I don't really mind it, but I'm surprised they didn't use the Agents map instead, it's much closer to appropriate.
At one time, I made decals for a number of maps inspired by the Agents one, including some pirate-y variations. Here they are, if you missed them and want to print your own pirate maps.
The pics are thumbnails, click them for the full size images. These and all 2x2 designs I produce are meant to be printed to a size of 1.551cm x 1.551cm (which is roughly 835dpi at this resolution). Don't ask me why I work at 835dpi, I never meant to, but they print very nicely that way.
The first is the original, the second is just more colourful, the third is meant to symbolize
El Dorado or any of the various
golden city legends, and the last two are the more historically accurate 'plain' style that would look great when used with your Pirates/Conquistadors.

Pirates/Explorers/Conquistadors

Indy/Adventurers