Loisto Mariner is the best companion to boater: tools for navigation, weather forecast and identifying of other boats with Automatic Identification System (AIS) are always in your pocket!

Navigate easily with the Finnish nautical map or hike with the precise topographical maps.

Loisto Mariner takes you where ever you want to get:
• Find your destination with the advanced location search provided by the National Land Survey of Finland.
• Enjoy boating also on the lake area – the nautical chart covers Finland’s inland waters like Lake Saimaa.
• Navigate on Finland’s marine area with familiar Finnish nautical charts.
• Hike with the precise topographical maps.
• Plan your routes on land and in the sea.
• Check the weather forecast and find a place to rest from a guest harbor.

** The clearest and highest quality maps of Finland on the same app. **

The nautical charts and topographical maps are precise and in vector format. The nautical charts of the app are based on the material of the Finnish Transport Infrastructure Agency.

The areas of the map are matching with the published nautical charts of areas A, B, C, D, E, F, G, J, K, L, M, N, O, P, R, T, V, 480 and 481 (excluding series S).

The general nautical charts cover Åland, Archipelago, Gulf of Finland and Lake Saimaa. The topographical map is based on the most accurate material from National Land Survey of Finland.

The combined view of the topographical map and nautical charts is even more detailed.

You can use the maps also offline. Save the offline maps to your device and plan routes and navigate successfully, where ever you may roam.

** The advanced search covers thousands of locations. **

Navigate precisely to the destination. The search function of this app you can find the right places. The index is based on the location database of the National Land Survey of Finland.

** The AIS data helps you to identify other boats. **

See the maps from the bird’s-eye view (3D) and you can easily get a quick glance of your route.

With the compass tool, you can measure distances and directions while navigating. Your track will be visualized on the map as a clearly distinguishable line. You can decide the length of the direction vector from the settings.

** Plan routes and save your favorite locations. **

Measure the distances between places, the length of the route and duration of the trip. You can easily save your favorite spots on the map.

** Stop by at the guest harbor. **

The app helps you to find the guest harbor along the Finnish coastline and on the lakeside. The services of the harbors are listed. The information is provided by Suomen Vierassatamat Ltd.

** Share your location and the spectacular view! **

You can share your location straight from the app to your favorite social media services. Choose one of your own images or a screenshot from the map to be shared.

You can start sharing by long pressing your location icon on the map.

** Reliable weather forecast always at hand. **

The local weather forecast is provided by the Finnish Meteorological Institute. Up-to-date weather forecast requires that your device is online.

** The yearly subscription fee is only 29,99 €. Start now navigating with Loisto Mariner! **

The subscription period is 12 months from the purchase. The price includes all map updates and app updates.

Payment will be charged to iTunes Account at confirmation of purchase. Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period.

Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal.

Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user’s Account Settings after purchase.

The terms of use and the privacy policy can be found on

What’s New

Version 1.4.3

Small improvements.

App Privacy

The developer, Tapio Palvelut Oy, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Location
  • Identifiers
  • Usage Data
  • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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