basicly it works on the AIS System, providing additional information am I right?
Correct. ShipTrax is a combination of:
1. AIS Receiver
2. ShipTrax software to display the ship positions, details, photos, etc. Log ships received, generate daily reports, provide alerts, fleet-watch, etc.....
3. ShipTrax network, tracking 8000+ ships globally and displaying these in the ShipTrax software.
So, for example, this screenshot shows the ShipTrax software tracking ships from my ShipTrax beta hardware, a TCP/IP feed from shipplotter (via. SP2TRAX), and the ShipTrax network.