Rhumb: Boat GPS & Sea Chart

Rhumb puts your boat on a sea chart. Open it and you see your position, course and speed, with buoys, lights, depths and named islands and capes around you. It is made for boats with no chart plotter: RIBs, day boats, small yachts, dinghies and kayaks. Every sea is included from the first launch, and you do not need an account. Rhumb is a recreational navigation aid, built by a Yachtmaster Offshore skipper who uses it on his own boat. Use it beside official nautical charts. The depths come from open seabed data and are estimates. Use Rhumb as a boat GPS and marine map for sailing, motor boating, fishing trips and paddling. It is a boat navigation aid for pleasure trips near the coast. Crew on someone else's boat get their own view of position, course and speed. THE CHART • Every sea is on the chart: buoys, beacons, lights and harbour marks from OpenSeaMap on a clean base map • North-up, always. The chart does not rotate, and your boat and your course do • Day, twilight and night appearances that switch with the sun at your position • Your position, course over ground (COG) and speed over ground (SOG), live on the chart • Depths: contour lines from 2 m to 5000 m, shading in bands down to 200 m, and soundings, worldwide and free. They come from open seabed grids and survey data (EMODnet, GEBCO, Kartverket, NOAA). Use them to see the shape of the seabed, and check them against an official chart • Islands, capes and hill heights near the coast are named, and hills on land are shaded • Rhumb needs a data connection for the chart today, and offline charts are in development ON THE WATER • Dividers: rhumb-line distance and bearing between any two points, in nautical miles and °T • Full-screen instruments: COG and SOG, readable at arm's length at the helm • Markers: name and categorise anchorages, hazards and marinas. They are stored in your own private iCloud, where only you can read them RHUMB PREMIUM • Auto-routing: tap waypoints and get a route that avoids land, with the distance for every leg • Average SOG over the last minute, ten minutes and hour, live on the instruments and kept complete in the background. Watch the tide help or hurt on passage • £19.99 a year or £3.99 a month, with a one-week free trial. The chart and the tools above stay free, and you can cancel in your Apple Account settings at any time. The subscription renews automatically unless cancelled at least 24 hours before the end of the current period. Payment is charged to your Apple Account. IMPORTANT Rhumb is an aid for recreational planning. It does not replace official charts, official publications, or safe navigation practice. Routes avoid land. They do not check depth, so always verify depths against your chart. Depths come from open seabed grids and survey data (EMODnet, GEBCO, Kartverket, NOAA). They are estimates for planning. They are not official charts and must not be used for navigation. Outside Europe most depths come from GEBCO, which uses mean sea level, so at low tide the water can be shallower than Rhumb shows. Terms of Use: https://rhumbapp.com/terms Privacy Policy: https://rhumbapp.com/privacy