ReefMap: Marine Navigation

ReefMap is offline-first marine navigation for boaters, fishers, divers, and reef explorers. Download your waters once and navigate with no signal — nautical charts, GPS, and the safety tools you actually need — free forever. WORKS OFFLINE Save an OpenStreetMap and OpenSeaMap region for use miles offshore — charts, your GPS position, waypoints, tracks, and routes. No cell signal required. Satellite imagery and Ocean relief require internet and are not included in offline downloads. CHARTS & POSITION • Satellite imagery from Esri as the default view (requires internet), or switch to the OpenStreetMap chart • OpenSeaMap nautical seamarks layered on top, with an opacity slider • Optional Ocean relief (NASA): satellite-derived land imagery and shaded seafloor relief from August 2004 for regional overviews. Requires internet; limited detail, without depth queries or detailed reef and fishing…