How do I make a boat move without a vehicle seat?

So we're making a game that involves boats. But the thing is, we want the boats to be controlled not by a vehicle seat, but by another script. I've tried a lot of things to get it to work, but I can't seem to get a smooth way to make the boat move. The water is default roblox terrain water. If anyone has a link or something that could help me get the boat to move like a boat, I would highly appreciate it. Thanks.