qtVlm is a navigation software for Sailing Boats. The application has a free version with basic features and a full version available through in-app purchase.

The free version of qtVlm is a full grib viewer displaying all types of gribs and providing many advanced grib functions. It supports basics charts and some simple instruments. It includes also an Anchor Alarm module, a viewer for shapefiles, for instance those coming from SHOM, and can be configured to receive boat position either from internal GPS or from an external NMEA source connected through tcp, udp or gpsd.

The full version adds many functions and features:

- Weather routing and route modules,
- A complete set of navigation Instruments,
- Charts modules for Raster charts, Vector charts and mbtiles,
- Iridium GO! communication
- AIS,
- Start line mode,
- Access to Great Circle gribs,
- SMS messages on Anchor alarm.

qtVlm can also be used in Simulation Mode, which allows you to simulate a navigation through our server. This is the best way to learn using qtVlm.

Once activated the full version will be available on all your iOS devices.

What's New

Version 5.8.2

-SHOM open data display
-SKIRON gribs (several models available) can now be downloaded directly.
-Add a timeline slider to move grib's date more easily.
-AIS Module: Possibility to define a list of MMSI that will generate an alarm as soon as they appear.
-POIs: Add possibility to input a comment for each POI.
-Barriers and Pathways: Add import/export mechanism.
-New data Reflectivity in gribs, routing and routes.

Ratings and Reviews

Not working after update

T. Zweep

I have a paid version on my IPad. After last update ik got a lite version. Not working anymore. There is no way te make contact , no email.

Developer Response

Can you please contact us at so we get this fixed?
Did you try to reactivate the complete version through qtVlm menu?


Meltemus SAS
120.6 MB
Requires iOS 8.0 or later. Compatible with iPhone, iPad and iPod touch.
Age Rating
Rated 4+
© 2015 Meltemus SAS
In-App Purchases
  1. Full version € 39,99


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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