Comparison

OpenSeaMap vs KartenWerft NavGo 2.0

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

KartenWerft NavGo 2.0

This navigation app displays detailed digital nautical charts for sport boats, showing your GPS position and relevant information like depth restrictions and bridge heights. An in-app purchase unlocks advanced features such as route planning and AIS signal display.

Highlights
  • Digital nautical chart display
  • GPS position tracking
  • Nautical information overlay
  • AIS signal visualization
  • Route and waypoint planning
  • Measurement tools
Features
Read full description

NavGo 2.0 ist eine Navigations-App für Sportboote. Zur Verwendung sind die SeeKarten Digital (ab € 69,90) der westlichen Ostsee oder die BinnenKarten Digital (ab € 39,90) deutscher Binnenwasserstraßen von der KartenWerft erforderlich. Die kostenlose App NavGo 2.0 stellt die detaillierten Karten dar und zeigt darin die aktuelle GPS-Position. Darüber hinaus beinhaltet sie alle nautisch relevanten Informationen des jeweiligen Reviers. Hierzu zählen z.B. Tiefgangsbeschränkungen, Brückendurchfahrtshöhen, Geschwindigkeitsbeschränkungen, Liegemöglichkeiten, Bootstankstellen, Betriebszeiten und Kontaktdaten von Schleusen und Klappbrücken sowie temporäre Einschränkungen. Durch ein Upgrade auf NavPro (In-App-Kauf für € 29,99) kann die App um zusätzliche Navigationsfunktionen erweitert werden wie Markierungen, Wegpunkte, Routen, Tracks, Messwerkzeug, AIS oder MOB. NavGo 2.0 ist das Nachfolgeprogramm der beliebten App KartenWerft NavGo. Es basiert auf einem modernen Code und genügt aktuellen Sicherheitsanforderungen. Neben der neuen internen Struktur und einem angepassten Layout beinhaltet NavGo u.a. folgenden neue Funktionen: - Darstellung von AIS-Signalen in der digitalen Karte, die vom bordeigenen AIS-Empfänger kommen - Möglichkeit zur Reaktivierung eines abgelaufenen RevierService - Kartenansicht mit maximaler Vorausschau - Englische Version der App (neben Deutsch)

Screenshots

OpenSeaMap4 screens
KartenWerft NavGo 2.04 screens

Verdict

The call

The clearest difference is rating: KartenWerft NavGo 2.0 at 5.0 against OpenSeaMap's 1.0. KartenWerft NavGo 2.0 also leads on review sentiment (71% vs 38%) and iOS requirement (12.0 vs 18.6). On price, ratings volume, update cadence and ads 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

Both are free to download. OpenSeaMap sells 1 one-off in-app purchase and KartenWerft NavGo 2.0 sells 10 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

KartenWerft NavGo 2.0 holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews point the same way: 38% of OpenSeaMap's written reviews are positive against 71% of KartenWerft NavGo 2.0's.

UpkeepUpdate frequency

OpenSeaMap ships an update every 2 months, KartenWerft NavGo 2.0 every 5 weeks. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

Scorecard3 real differences · 7 level
OpenSeaMap versus KartenWerft NavGo 2.0: the parameters behind the verdict, then further details
ParameterOpenSeaMapKartenWerft NavGo 2.0
PriceFreeFree
Rating1.0 (1 ratings)5.0 (1 ratings) — better
Positive reviews38.3% of reviews71.4% of reviews — better
Number of ratings11
Update frequencyEvery 2 monthsEvery 5 weeks — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS18.612.0 — better
Further details — not scored
Size13 MB82 MB
Age rating4+4+
Developerappdoctors UGKartenWerft

Customer experience

OpenSeaMap

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

KartenWerft NavGo 2.0

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews21 reviews
Positive71.4%
Neutral4.8%
Negative23.8%

In-app purchases

1 purchases

OpenSeaMap

One-time1
  • OpenSeaMap Professional$1.99
10 purchases

KartenWerft NavGo 2.0

One-time10
  • BINNENKARTEN ATLAS 9$22.99
  • BINNENKARTEN ATLAS 11$22.99
  • BINNENKARTEN ATLAS 12$22.99
Show 7 more
  • BINNENKARTEN ATLAS 2$22.99
  • BINNENKARTEN ATLAS 3$22.99
  • BINNENKARTEN ATLAS 4$22.99
  • SEEKARTEN ATLAS DE1$34.99
  • SEEKARTEN ATLAS DK1$34.99
  • SEEKARTEN ATLAS DK2$34.99
  • SEEKARTEN ATLAS DK3$34.99

Questions

Is OpenSeaMap free?
OpenSeaMap is free to download, with in-app purchases available.
Is KartenWerft NavGo 2.0 free?
KartenWerft NavGo 2.0 is free to download, with in-app purchases available.
Which has better reviews, OpenSeaMap or KartenWerft NavGo 2.0?
KartenWerft NavGo 2.0 is rated higher. OpenSeaMap averages 1.0 out of 5 from 1 ratings, while KartenWerft NavGo 2.0 averages 5.0 from 1 ratings.
Do OpenSeaMap or KartenWerft NavGo 2.0 have ads?
Neither OpenSeaMap nor KartenWerft NavGo 2.0 shows ads.
Which is updated more often, OpenSeaMap or KartenWerft NavGo 2.0?
OpenSeaMap ships an update every 2 months, and KartenWerft NavGo 2.0 every 5 weeks. Most recently, OpenSeaMap was updated on November 1, 2026 and KartenWerft NavGo 2.0 on November 3, 2026.

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