I have not decided on a name for RuneScape gold the mini-game yet so I will look in ideas. This is a harmful mini-game. Your team, you and your ship could end up at the bottom of the sea so be prepared. What happens is you roam the sea looking for boats to kill.
You can't teleport out. When you see another ship you engage it. Should you sink it, then you can have your team search for the loot. Imager36 brought up a good point about flying enemies boats. In case you've got other players and crewmembers aboard your boat, then you can board the enemies boat. It will require higher agility levels depending on where you plank. If you board from the deck, simply walk across a plank - 10 Agility.
Or you can slip below deck and scale through a cannon space with a rope - 70 Agility. If you do board the enemies ship, you can die. You can now also Melee other players on the enemy ship. If you kill all gamers around the enimies ship - NPC's can not be assaulted - You can take their team and force them to work for you - they have to walk the plank... MUAHAHAHAHA - and also can take control of their ship, and market it or keep it for yourself. There's a forfeith button on the stern of each ship, where that ship and crew are attracted back to the mainland with all their items and the boat. The loot will be supplies on the boat and matters the players drop when the expire.
Redmonke suggested that the ability ought to have a skillcape. Well I had been thinking it ought to have an image of a boat on the cape, with a sailor in the backround. The emote would be: You hope onto a mini-ship and then start sailing on the land. Girfaniam proposed Fishing Boats. I'm now adding onto his suggestion.
At level 20 you will have the ability to earn a fishing vessel. This ship will be a little wooden row boat. Additionally on your ship you would be able to visit the port side and PORT SIDE ONLY (Unless you have weapon implacments there) You will have the ability to fly fish or use a normal fishing pole. This experience will obviously go to buy OSRS gold fishing. Or you can just stop by the nearest port.