some of IL's explanation is not correct
we dont have nation specific convoy SZ lists
only have the sea sectioned in north pacific, south pacific, north altantic, south altantic, etc
we don't have "adjacent" requirements
each submarine in north altantic affects enemy north altantic shipping as a whole
I can hear the arguments already about what IPCs get affected and who gets to decide, and I wanted something I could point to.
this occurs now and then and more so in AARHE due to the combined team turn
OOB/LHTR rule applies ===> if teammates argues, the enemy decides