Sail safe

Sail safe

Save money

Save money

Discover new places

Discover new places

Preserve your memories

Preserve your memories

logo-white is the best navigation application for Masurian sailors. The most accurate nautical charts were created specifically to cover your needs. We have created innovative features to make sailing even more comfortable and safe.
 logo-white is an irreplaceable application to find the right direction on the Masurian Lakes.

The best navigation charts of Masurian Lakes

Taider contains the best bathymetric charts, made on the basis of newest bathymetric surveys. Our charts cover all of the Great Masurian Lakes and are very clear and intuitive in usage. Having them makes you able to sail even during the night or in the fog. On Taider charts you will find all necessary information like depth, ports layouts, jetty locations, moorage spots, silence zones, reeds, forests and buildings. Despite that, our charts are small (only 2,0 MB), and are downloaded only once and keept in your device memory to save data transmission.

Bathymetric charts of lakes currently available in Taider app: Bełdany, Boczne, Bodma, Dargin, Dobskie, Guzianka Mała, Guzianka Wielka, Jagodne, Kirsajty, Kisajno, Łabap, Mamry, Mikołajskie, Nidzkie, Niegocin, Popówka Wielka, Przystań, Roś, Ryńskie, Seksty, Sztynorckie, Szymoneckie, Śniardwy (Bramka Sekstyńska), Święcajty, Tajty, Tałtowisko, Tałty, Warnołty. More lakes soon.

Najlepsze żeglarskie mapy jezior

Unmarked hazards

Taider's charts contains even that shallow places and stone reefs which have not been marked with buoys on the water. When sailing on Masurian Lakes, you don’t have to be limited by lateral marks. Feel safe and free to sail across all the Great Masurian Lakes.

Nieoznakowane przeszkody

Collision alert

Taider has an innovative warning system. You don’t have to frequently check your position on the map. Taider will warn you about nearby hazards by emitting a sound signal, and give you the time to correct your course.

System ostrzegania przed mieliznami

Pricing in marinas

Wonder which port fits your needs? By clicking prices, information about available infrastructure will be displayed.

Please note that Taider only aggregates price lists from available sources. Actual prices and services available at ports may vary and are determined and changed by the managers on an ongoing basis.

Cenniki portów na Mazurach

Mooring spots

Masurian Lakes show their true beauty away from loud and crowded ports. Taider will show you all the best places for mooring at the shore.

Miejsca do cumowani

Cruise info

Before you sail on a cruise, click Cruise info. Your current speed and trail will be shown, and Taider will start recording the trail. After returning from a cruise, you can recall memories by replaying the route you have traveled on eg. using Google Earth.

Cruise info

Sailors about Cruise info

'Absolutely the best nautical charts I have ever used.'


'Collision alert saved us from stress and loss of deposit!'


'Thanks to Taider we stopped sticking to the same trail and started to discover places we didn't know before.'


'We won the regatta! Thanks to Taider's charts we did a maneuver that bring us victory.'


Get it on Google Play

Older version: DOWNLOAD

Get it on App Store

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Frequently Asked Questions

Point objects

Port/marina - paid place for boat service with adapted infrastructure.
Camping site - paid place with a minimal or none infrastructure.
Mooring spot “in the wild”. Remember that mooring is forbidden in the reserves and directly to the trees. Please keep environment clean, take your litter with you.

Lateral marks, region A. Masurian Lakes trails are marked from north to south and from west to east.

Starboard hand mark
Port hand mark
Trail branching

Cardinal marks - indicates the position of a hazard and the direction of safe water. Please take attention - sometimes buoys can be in incorrect position on the water, e.g. swapped sides.

North mark
East mark
South mark
West mark
Underwater stones
Other point danger, e.g. underwater piles
Fishing net. Most often, the icon indicates the furthest point of the net in the lake (it means the net is placed between the icon and the lake shore). Sometimes, especially during the off-season, fishermen also pledge other nets at different places on the lakes, sometimes marking them only with plastic bottles).
Gas station available for boats
Flash warning mast. Signals:
  • 40 flashes per minute means "CAUTION" - EXPECTED STORMS AND WIND.
  • 90 flashes per minute means "DANGER" - STORM AND HIGH WIND.


Dangerous areas - navigational hazard (e.g. shallows, stone reefs). When approaching to this kind of area, Taider will start the alarm to make sure you will not miss the danger.
Forest, trees

Linear objects

Overhead power lines with marked line height above the water.

The charts were prepared on the basis of bathymetric surveys performed by our company and they are the most accurate available on the market. On our charts you will find:

  • almost 200 marinas and campsites
  • over 1860 jetties
  • almost 700 mooring spots
  • over 200 navigational hazards

Current prices can be found by one click in the app. You can use Taider from PLN 0.68 a day.

Bathymetry of the southern and eastern part of Lake Śniardwy is now available in the Taider app. Surveys will be continued in 2024, and the charts will be systematically updated.

The water level for Taider is the average water level in the Great Masurian Lakes system: 115 cm - on the water level gauge in Giżycko, 140 cm - on the water level gauge on Lake Przystań, 100 cm on the water level gauge in Maldanin (Lake Roś). If on the above mentioned water level gauges, current readings are higher than the given average, you should add that difference to the Taider map readings.

If the water level is lower than given averages, then such a difference should be subtract from the map readings. The water level in the GML system is usually higher at the beginning of the season and lowest at the end of the season. The biggest water level drops occur on the Lake Roś.

Contact information

Feel free to contact us via email: biuro [at]


Navcart sp. z o.o.
Świętokrzyska Street 30/63
00-116 Warsaw

Company information

Wpis do rejestru przedsiębiorców Krajowego Rejestru Sądowego pod numerem KRS 0000 423 689, prowadzonego przez Sąd Rejonowy dla m. st. Warszawy, XII Wydział Gospodarczy Krajowego Rejestru Sądowego. Kapitał zakładowy 100.000 PLN, NIP: 701-034-52-01

Terms of use

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