Dredging for Gold

Publisher's blurb:

This module has your heroes dredging a shallow bay for lost treasure aboard the Skipjack Argentum, trying to recover a horde most thought entirely mythical. From navigating to the right spot, to dredging and recovering from the dredge hanging up, there's plenty of excitement on the fishing grounds, and some more while trying to tack back to harbor in the evening. This is a good way to introduce an shipwreck and recover a specific item of loot off it, or just add some flavor as a plot hook along the coast.

This two page adventure should be enough to get you started with maritime mayhem in existing games without having to learn a whole new naval gaming system.