What is the cost impact to the gang leader who has a ratskin map?
According to ORB page 99 the cost of an item that is added to a fighter's cost is the cost of the item paid without the variable component. Since the Ratskin map has a total variable cost you should add the cost paid to the gang leader. In addition, any other items that have only a variable cost will add that cost to the fighter that is equipped with it.
