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

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

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