OpenSeaMap vs WWF Nautical Chart
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OpenSeaMap
This app provides a free, worldwide nautical chart with detailed sea information, including lights, weather data, and harbor details. It offers chartplotting, waypoint management, and offline map caching for navigation. Users can mark locations, enter coordinates, and adjust chart zoom for optimal viewing.
- Free worldwide sea chart
- Chartplotting with tracking
- Waypoint creation and export
- Offline map caching
- Mark and search locations
- Adjustable chart zoom
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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.
WWF Nautical Chart
This app helps users navigate Wismar Bay and the Bay of Greifswald, highlighting sensitive areas and boating rules within Natura 2000 zones. It provides information on protected areas, fishing regulations, and bird species to promote harmonious coexistence between people and nature.
- Pinpoint location in Wismar Bay and Greifswald Bay
- Shows sensitive areas and boating rules
- Identifies protected Natura 2000 areas
- Provides information on nature and regulations
- Includes fishing and bird information
- Routing function with waypoints
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The app can be used to pinpoint your location in Wismar Bay and the Bay of Greifswald It also shows the particularly sensitive areas and boating rules in the voluntary agreements within the Natura 2000 areas. Users, e.g. people who are fishing, sailing, motor boating, kite-surfing, rowing, kayaking or canoeing, can see on their smartphone or tablet at any time whether they are inside or outside protected areas. It is no longer a valid excuse to say you don’t know where you are! The app is designed to help you comply with the BOATING RULES. Improved navigation on the water will reduce disturbances in the protected bays and in the breeding and resting areas of waterbirds. It is intended to help ensure that people and nature can co-exist in harmony in the species-rich coastal waters. Interesting information about NATURE is provided for individual areas and the legal regulations are also available for anyone who wants to know more. HOW THE APP WORKS Navigate through the Wismar Bay and the Bay of Greifswald using the routing function. Waypoints make it easy for you to avoid the protected areas. Click on the red and orange zoning or colour-coded protected areas to learn more about nature and special regulations. The “Nature” section contains a glossary with explanations of protected areas, regulations and institutions. In the “Fish” section you can find useful information about fishing, including a description of individual fish, fishing seasons, minimum sizes, periods closed to fishing and the Red List status of the individual species. The “Bird” section features common birds with photos and audio. Detailed maps can be downloaded under “Info” and then “Nautical charts”. FEATURES: - Waypoints can be set with the routing function. The distance and course of the selected route are automatically displayed. - Orange and red areas indicate when boating is permitted in the area or not. - If the boat crosses the boundary of a restricted protected area, a message automatically appears on the map. - Coloured areas provide information about the protected areas (including nature conservation areas and fish sanctuaries). - Minimum sizes and seasons closed for fishing: during the season when fishing is not permitted for a species, a crossed-out fishhook appears next to the fish. - Winter sanctuaries, fish and spawning sanctuaries are only shown on the map during the period closed for fishing. - Use the layer icon to show and hide the areas for boating and fishing. Have a great day out on the water! Enjoy your visit and please respect nature!
Screenshots
Verdict
The clearest difference is review sentiment: WWF Nautical Chart at 100% against OpenSeaMap's 38%. WWF Nautical Chart also leads on in-app purchases (none vs 1) and iOS requirement (14.0 vs 18.6). OpenSeaMap's advantage is update cadence (every 2 months vs every 6 months). On price, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. OpenSeaMap sells 1 one-off in-app purchase. WWF Nautical Chart asks for nothing beyond the download.
OpenSeaMap ships an update every 2 months, WWF Nautical Chart every 6 months. Both last shipped on October 12, 2026.
| Parameter | OpenSeaMap | WWF Nautical Chart |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) — better | — |
| Positive reviews | 38.3% of reviews | 100.0% of reviews — better |
| Number of ratings | 1 — better | — |
| Update frequency | Every 2 months — better | Every 6 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18.6 | 14.0 — better |
| Further details — not scored | ||
| Size | 13 MB | 263 MB |
| Age rating | 4+ | 4+ |
| Developer | appdoctors UG | WWF Deutschland |
Customer experience
OpenSeaMap
WWF Nautical Chart
In-app purchases
OpenSeaMap
- OpenSeaMap Professional$1.99
WWF Nautical Chart
No in-app purchases
Questions
Is OpenSeaMap free?
Is WWF Nautical Chart free?
Do OpenSeaMap or WWF Nautical Chart have ads?
Which is updated more often, OpenSeaMap or WWF Nautical Chart?
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