Originally Posted by Parisnice
...I need an AIS Transmitter only, to be seen, and for anti-theft purpose as well....
It impossible to find a ship AIS transmitter-only. All ship AIS transmitters must have a receiver. If you understand how AIS works, this would be obvious: they use a self-orgnizing network. Every transmitter has to have a receiver included so it can listen to the traffic being sent and select an appropriate time slot for its entry into the self-organized network which is a time-sharing network where all devices transmit on the same frequencies, just at different times.
Here is a short list of Class-B AIS transponders that compares basic features:
You will also (most likely) need a ship station license
and an MMSI from your country's maritime radio