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OpenSeaMap vs Aqua Map: catalog facts
OpenSeaMap	Aqua Map
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Best for: Sailors and paddlers who want free, community-maintained nautical charts	Best for: Recreational boaters navigating US coastal waters, the ICW and the Bahamas
Free Free to use and download.	Free + paid options Free to start, with paid options for additional charts and features.
Web	Android, iOS
Free charts built on OpenStreetMap Downloads for OpenCPN, Garmin and Lowrance Anyone can add and correct seamarks	Uses NOAA, USACE and CMOR chart sources Charts available offline Anchor alarm for drift warnings Coverage of the Bahamas and the ICW
Community data is not an official chart Coverage and depth detail vary by region Some downloadable chart bundles are several years old	Chart coverage centres on US waters and the Bahamas Some features require payment Not open source
Web application	Downloadable app
Not open source	Not open source
License not stated	License not stated
No account needed	Not stated if an account is needed
Not stated if it works offline	Offline features available
Official website Full listing and sources Sources for OpenSeaMap openseamap.org Catalog checked September 23, 2026	Official website Full listing and sources Sources for Aqua Map aquamap.app play.google.com/store/apps/details apps.apple.com/us/app/aqua-map-boating/id919552329 Catalog checked September 23, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.

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