Really good, I wish I had VS right now
There is a demo of Virtual Sailor 7.
www.hangsim.com/vsIt is right there at the link above
It allows you to replace the 7 default DEMO ships and DEMO environment with 7 ships and one environment of your choice. The down side is that it is timed, but you can open it again and again and continue from where you left off. Select Cruise lets your select a cruise you made or the default. Create Cruise lets you choose the ships you want to sail, you can choose the Environment(s) location of your ship and choose the Weather, time, and foecast. And to start it, hit Start Cruise on the bottom right to start simulation. If you want more ships and environments, and want to play with other VS players, you must purchase the Full Version ($30.00) with PayPal.com and after that, you will be able to play with tons of ships from the VS Library also sail around the world (Enviroments) and play Multiplayer (with others) from the menu at top left in-game when you hover over it, and hover over Connect to see the servers and others.