Hi There, to reply to what you asked about the add on, it is up to you, but personally, i wouldn't stick to ship simulator 06, ship simulator 08 is far better, and it has multiplayer, and plus, if you get the "New Horizons" add on, you can captain the ocean star. Although you will have to have a top spec PC to run ship simulator 08 well.
Oh and, welcome to the forum
![Wink ;)](http://forum.shipsim.com/Smileys/default/wink.gif)
Jack.