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OpenSeaMap vs Argo: catalog facts
OpenSeaMap	Argo
Screenshots	Screenshots
Best for: Sailors and paddlers who want free, community-maintained nautical charts	Best for: Recreational boaters who want charts, trip planning and local knowledge from other boaters
Free Free to use and download.	Free + paid options A basic plan is free; paid plans add further features.
Web	Android, iOS, Web
Free charts built on OpenStreetMap Downloads for OpenCPN, Garmin and Lowrance Anyone can add and correct seamarks	Free plan includes nautical charts and manual routing Crowdsourced reports and reviews of places and marinas Tide, current, wind and wave forecasts Offline charts and routes
Community data is not an official chart Coverage and depth detail vary by region Some downloadable chart bundles are several years old	Autorouting and some features sit in paid plans Social features depend on how many boaters use it in your area
Web application	Downloadable app, Web application
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 Argo argonav.io Catalog checked September 23, 2026

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

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