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