Cheers BBW, many thanks for the info
I am just doing a simplified layer with only arctic convoys for my GWX 13th Flotilla careers, so I can have way faster loading times (The Achilles Heel of this game

). My layer is only 1943 onwards and has JW-WJ convoys, some random task forces, russian & german coastal traffic and some hunter killer group in 1945. A quick job, but 100 times worth it
I will ask later how to add german aerial support near Cape North