It has taken me 5 patrols , each time returning to a friendly port to resupply in order to get this far .
I use the lite campaign which reduces the tonnage . This is as far as ihave got in SH5 , if you finish one of the missions doesnt that unlock some other patrol areas ?
I have no freakin idea . You should have another mission up north where you have to sink a carrier and armed merchants or something .
As far as fuel is concerned , i travel at 10 knots and arrive with 68% fuel and then travel at 5 knjots in the patrol area . I return to base with 40% fuel and arrive at base with 15%.