Depends on where you are going even if you do have a transmitter. To show up on the web AIS sites, you would need to be coastal cruising in range of a base station. Another coastal cruising option is a cell based AIS called Boat
Beacon. It, coupled with MAIS will,show up on that site. I have been using a spot in northwest Gulf of Mexico
and it has worked great. I have it plugged in and it transmits continually when I am on the move.