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Argo vs OpenSeaMap: catalog facts
Argo	OpenSeaMap
Screenshots	Screenshots
Best for: Recreational boaters who want charts, trip planning and local knowledge from other boaters	Best for: Sailors and paddlers who want free, community-maintained nautical charts
Free + paid options A basic plan is free; paid plans add further features.	Free Free to use and download.
Android, iOS, Web	Web
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	Free charts built on OpenStreetMap Downloads for OpenCPN, Garmin and Lowrance Anyone can add and correct seamarks
Autorouting and some features sit in paid plans Social features depend on how many boaters use it in your area	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	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 Argo argonav.io 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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