qtVlm Icon


Navigation and Weather Routing software

4.4 Stars (10)
638 Downloads (This Week)
Last Update:
Download qtVlm-5.5.8-patch1-64.tar.gz
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qtVlm is a Navigation and a Weather Routing software for sailing boats.

It can be used in three modes:

- Real Navigation with NMEA data and instruments, AIS, Routing, etc.
- Simulation mode: Wind and Currents data from grib will be used to move the boat according to it's polar. AIS targets through Internet.
- Virtual Racing mode designed to manage and pilot virtual boats, for instance VLM.

qtVlm accepts charts in S57 format, in Raster format (kaps, geotiff, etc) or in mbtiles format. It can also load online maps from various sources.

It is also a general grib viewer, and can read all known grib sources, format 1 or 2.

qtVlm is also available on Android and iOS, through the respective stores.

We cannot reply to reviews. Full documentation in English and French available from the Help menu

qtVlm Web Site


  • Grib viewer
  • Navigation Instruments
  • Weather Routing
  • Raster charts
  • mbtiles
  • S57 charts
  • Anchor Alarm


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User Ratings

ease 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 4 / 5
features 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 4 / 5
design 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 4 / 5
support 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 4 / 5
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User Reviews

  • 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5

    Bug, since 5.5-6, multi routing (ie: generate 8 routes hour per hour) does not work anymore, it produce the first route and that's it ! Mode : real mode OS : windows 10 home x64 update setup : Qtvlm 32bit (while the 64 crash !). hardware : celeron N3450 low power (for real life / real mode). regards.

    Posted 07/24/2017
  • 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5

    BUG with 5.5.1- patch 2 and 5.5.2 : weather routing no longer respects the boundaries of the land while it was functioning properly up to the previous version. OS: MacOS Sierra 10.12.4

    Posted 05/21/2017
  • 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5

    5-4-10 : looks like the 64 bits-tar is not uploaded (still 5-4-9 modified date but same On the windows 5-4-10, I still have a problem with routage a parcours. Not sure it's a qtvlm prob. J'ai l'impression que le paquet 5-4-10 en 64 bits pour linux n'a pas été uploadé correctement. Dans la version pour windows, j'ai toujours un probleme pour multirouter un parcours. Pas certain que ce soit un pb qtvlm ( ça le faisait déjà avec la 5-4-9 sur windows, sans le faire sur ubuntu).

    Posted 04/18/2017
  • 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5

    PLEASE DO NOT REPORT BUGS HERE WE CANNOT REPLY TO REVIEWS. Use qtVlm forum or contact support at meltemus.com instead. Test multirouting works ok here. For 64b you probably need to check "Install MSCV 64bits libraries" when installing.

    Posted 11/02/2016
  • 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5

    Hi, Release / MAC OS / qtvlm macOS v5.4.2.dmg seems not working. From the start of the installation, a message states: "Unable to write in qtVlm folder /Volumes/qtVlm_5.4.2/qtVlm/testWrite.txt. Thnks for your help

    Posted 11/01/2016
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Additional Project Details


French, Czech, English, Spanish

Intended Audience

End Users/Desktop

User Interface


Programming Language




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