Yahnav is a program designed to help sailors to navigate with all kinds of vessels.

The software works the best with a PC or laptop equiped with Microsoft Windows XP, VISTA ,7, 8 or 10.

To receive the position a simple GPS-receiver, wich can be connected at a serial or USB-port and can produce NMEA-messages, will satisfy.

If the ship has an AIS-receiver you can see other ships on the chart.

For the background the program uses nautical vector-charts in the S57 standard.
A lot of those charts are free of charge. Unfortunately the charts are not yet available in all countries, but several agency's seem to work hard on it.
All available charts can be downloaded from the internet and will be translated to the format used by Yahnav.
The charts contain all information for the sailor to navigate safely. They contain the actual buoyage and the most recent soundigs.
Frequently updates appear for the existing charts, small files with, mainly little modificatons in the buoyage.
These updates can, after they've been downloaded, handled by Yahnav as well, so all modifications can made visible very easy.
The charts can be presented in different scales.

The user can add waypoints, wich can be shown in several ways.

During the navigation the actual position is continuous displayed on the chart. The chart will be refreshed automatic.

You may evaluate YAHNAV during 30 days. After that you have to register the program.