On the left (south?) of the map there are a collection of foreign trading "anchors". You can put a trading (or any fleet vessel) there. Presumably this is a good thing somehow.
- Where can I see the value of having the trading ship there in my finances?
- Do I need to keep a trading ship there all the time, or can it wander off immediately the port is captured?
- Is there any value in putting more ships there?
- Does it need to be a 'trading ship' to start the trade, or can any vessel go there?