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Screenshots

  • OpenSeaMap screenshot 1
  • OpenSeaMap screenshot 2
  • OpenSeaMap screenshot 3
  • OpenSeaMap screenshot 4

About OpenSeaMap

OpenSeaMap is a worldwide Opensource-project for creating a free nautical chart. Founded in 2009 the project gained a lot of attention lately adding more and more nautical information for free. Not even lights and other nautical infos are provided, but also more and more info layers like weather data, information about harbours and so on. As an add on to the OpenStreetMap this provides all missing info for nautical activities. OpenSeaMap is part of OpenStreetMap and uses the same database. FEATURES: - Free worldwide sea chart (incl. HD chart graphics) - Search for geolocations worldwide - Chartplotting with continuous tracking - Waypoints can easily be created, edited, deleted & exported - Mark locations in the chart - Zoom chart optically to fit your preferred reading size - Enter coordinates directly to be displayed in the chart - Offline caching of up to 1 million map tiles - Cleanup of chart cache data at any time To ensure future development and support of the OpenSeaMap app we encourage you to buy the In-App-Product "PRO". This will help keeping new updates and features coming. DISCLAIMER: OpenSeaMap is part of the OpenStreetMap and uses the same database. As an experienced navigator you should NEVER rely your descisions on one source of information alone. Please keep in mind that the OpenSeaMap can not replace official sea charts on bord of your boat. Please use the OpenSeaMap app only in conjunction with official sea charts and conforming to national and international regulations. Please recognize that no depth information is provided by this product. IMPORTANT: The continued use of the GPS can significantly decrease the battery level.

What’s new

Version 4.4 · Updated April 27, 2026

- NEW: Fixed issue on launch of the app - NEW: Updated the user interface to use the latest OS

App privacy

The developer, appdoctors UG, reported these privacy practices to Apple.

Data Not Collected

The developer does not collect any data from this app.

Alternatives to OpenSeaMap

Looking for apps like OpenSeaMap? Here are 6 similar apps on the App Store. The highest rated is SEAiq (4.7/5), and all 6 are free to download.

OpenSeaMap vs. alternatives
App Rating Price Last updated
OpenSeaMap 1.0 / 5 (1 rating) Free April 27, 2026
Open Sea OpenSeaMap Browser 3.2 / 5 (5) Free Jan 22, 2024
NV Charts GPS Navigation AIS 4.5 / 5 (114) Free Nov 12, 2025
Marine Navigation Lite – Free May 10, 2026
WinGPS Marine 1.3 / 5 (3) Free Mar 30, 2026
SEAiq 4.7 / 5 (193) Free Sep 28, 2026
NavShip - US Waterways 4.5 / 5 (11) Free Sep 16, 2026