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Aqua Map vs qtVlm: catalog facts
Aqua Map	qtVlm
	Screenshots
Best for: Recreational boaters navigating US coastal waters, the ICW and the Bahamas	Best for: Cruising and racing sailors who plan routes around weather
Free + paid options Free to start, with paid options for additional charts and features.	Free + paid options The GRIB viewer is free; mobile and tablet apps, chart packs and the GRIB service are paid.
Android, iOS	Windows, Android, iOS
Uses NOAA, USACE and CMOR chart sources Charts available offline Anchor alarm for drift warnings Coverage of the Bahamas and the ICW	Weather routing with departure-time comparison Reads S57, S63, raster and MBTiles charts AIS and NMEA instrument support Iridium GO certified
Chart coverage centres on US waters and the Bahamas Some features require payment Not open source	Mobile versions and chart packs are paid Wide feature set takes time to learn
Downloadable app	Downloadable app
Not open source	Not open source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is 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 qtVlm meltemus.com apps.apple.com/us/app/qtvlm/id999110023 Catalog checked September 24, 2026

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

Screenshots