From Naval Action-pedia
Player Trades between two players in the same port in Naval Action are possible by opening a trade window.
- Simply select another player in the same port and right click on their name in any chat window and select TRADE.
- If they're in the same port as you are the Trade window will open.
- Drag anything you're looking to trade out of your warehouse or enter a gold amount.
- They can do the same.
- When the trade looks correct press the "Make Offer" key
- Using PM or the Trade Chat window will keep the chatter from annoying others