Unless noted otherwise, the maps on SEA Undersea are based on images and data from OpenStreetMap. This information is copyright © OpenStreetMap contributors, CC-BY-SA. "CC-BY-SA" is short for Creative Commons Attribution - ShareALike 2.0 licensing. What this means, in a nutshell, is that the maps and map data were free to use and adapt, under the condition that the use was attributed (that's what this page is all about) and that any adaptation was shared under the same rules, which means you may use the maps images I've created, so long as you credit SEAundersea.com and OpenStreetMap. See the link to Creative Commons for more information.