Comparison

OpenSeaMap vs Germany HD GPS Nautical Chart

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Free worldwide sea chart
  • Chartplotting with tracking
  • Waypoint creation and export
  • Offline map caching
  • Mark and search locations
  • Adjustable chart zoom
Features
Read full description

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.

About

Germany HD GPS Nautical Chart

This app provides detailed nautical charts and marine weather forecasts for Germany, working offline without mobile coverage. It offers advanced navigation tools like route planning, distance measurement, and GPS tracking, along with extensive map overlays and user-friendly features for boaters.

Highlights
  • Offline nautical charts for Germany
  • Marine weather forecasts
  • GPS tracking and heading vector
  • Distance measurement tool
  • Route planning with unlimited waypoints
  • Map overlays (satellite, terrain)
  • Works in background mode
Features
Read full description

Flytomap is a valid and interesting alternative, Benetti Yachts Featured in : On the Deck Germany coverage resident in the app. It works WITHOUT mobile coverage! • Worldwide Marine and Outdoor Maps available when connected, thanks to viewer.flytomap.com • Worldwide Satellite images overlay on charts • Worldwide Terrain features overlay on charts, thanks to Open Street Map, Open Cycle Map, Bing,Earth,Topo Chart and GMap • Local Marine Weather forecast Use to Explore: √ Latitudes and Longitudes to go to your favorite places √ Search your Favorite points directly √ Zoom, Rotate and Pan fast just by a finger touch √ Quick Object information just tapping, thanks to vector technology √ GPS Heading Vector Towards the direction movement √ Distance Measurement Tool to easily calculate the distance from one location to another √ Route planning, unlimited Waypoints - Insert the target/destination and see in real time your speed, distance and bearing √ Magnifying glass for all info √ Unlimited Tracks, Markers, Geo-tagged photos, records and share via email, visible on Google, Flytomap Viewer, KMZ format - Store your track without the need of cellular data or mobile signal √ Select Depth Contours √ a la carte menu √ MOB - Man Over Board √ Quick WP - allows you to instantly record your position and show distance and bearing √ iOS background mode - Flytomap works in background as well, you can swap with another app and receive/make calls send sms while track recording. √ Optimized battery usage • Continuous update of all info (including reviews from the deck) about : • Marinas • Anchorages • Hazards • Local Knowledge √ Local Marine Weather forecast at a quick tap provide you: • Day max and min temperature - Current temperature • Significant wave height, Swell height, Swell period, Swell direction • Tide data • Wind Speed and direction • Weather description • Precipitation & Humidity • Visibility • Pressure • Cloud cover in percentage • Wind chill/Feels like Temperature • Dew Point Temperature • Heat Index Temperature √ And so much more to come - It’s the only app you will ever need! Our charts are installed on: NAVICO LOWRANCE B&G NORTHSTAR EAGLE SIMRAD Follow us: ▶Twitter @flytomap ▶Web Site flytomap.com ▶Web App viewer.flytomap.com ▶Facebook facebook.com/flytomap Flytomap is committed to constant improvement, this App is developed with the help of professional boaters to get the best experience on the sea, we listen to our users and systematically add the most requested features. Thank you for the feedback!

Screenshots

OpenSeaMap4 screens
Germany HD GPS Nautical Chart4 screens

Verdict

The call

The clearest difference is price: OpenSeaMap at Free against Germany HD GPS Nautical Chart's $19.99. OpenSeaMap also leads on review sentiment (38% vs 0%) and update cadence (every 2 months vs every 10 months). Germany HD GPS Nautical Chart's advantage is iOS requirement (12.0 vs 18.6). On ads, in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

OpenSeaMap is free to download; Germany HD GPS Nautical Chart costs $19.99 up front. OpenSeaMap sells 1 one-off in-app purchase and Germany HD GPS Nautical Chart sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

OpenSeaMap ships an update every 2 months, Germany HD GPS Nautical Chart every 10 months. The most recent releases landed on October 21, 2026 and October 20, 2026 respectively.

Scorecard5 real differences · 5 level
OpenSeaMap versus Germany HD GPS Nautical Chart: the parameters behind the verdict, then further details
ParameterOpenSeaMapGermany HD GPS Nautical Chart
PriceFree — better$19.99
Rating1.0 (1 ratings) — better—
Positive reviews38.3% of reviews — better0.0% of reviews
Number of ratings1 — better—
Update frequencyEvery 2 months — betterEvery 10 months
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases — betterPaid
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS18.612.0 — better
Further details — not scored
Size13 MB213 MB
Age rating4+4+
Developerappdoctors UGFlytomap

Customer experience

OpenSeaMap

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews47 reviews
Positive38.3%
Neutral12.8%
Negative48.9%

Germany HD GPS Nautical Chart

Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

1 purchases

OpenSeaMap

One-time1
  • OpenSeaMap Professional$1.99
1 purchases

Germany HD GPS Nautical Chart

One-time1
  • MOB - Quick Waypoint$1.99

Questions

Is OpenSeaMap free?
OpenSeaMap is free to download, with in-app purchases available.
Is Germany HD GPS Nautical Chart free?
Germany HD GPS Nautical Chart costs $19.99, and also offers in-app purchases.
Do OpenSeaMap or Germany HD GPS Nautical Chart have ads?
Neither OpenSeaMap nor Germany HD GPS Nautical Chart shows ads.
Which is updated more often, OpenSeaMap or Germany HD GPS Nautical Chart?
OpenSeaMap ships an update every 2 months, and Germany HD GPS Nautical Chart every 10 months. Most recently, OpenSeaMap was updated on October 21, 2026 and Germany HD GPS Nautical Chart on October 20, 2026.

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