The follow up conversation has been moved here:
https://www.axisandallies.org/forums/topic/36451/submarine-movement-and-customized-map
We are using a custom board and I don’t have the OOB map available. Is zone 12, Central United States, physically connected to a) zone 2, Ontario and b) Alberta/Saskatchewan/Manitoba or is movement blocked by the Great Lakes?
Clickable-to-expand map images of G1940 can be found here:
The answer is:
No, CUS is not connected to Ontario
Yes, CUS is connected to A/S/M
The lake does block movement, but according to the FAQ CUS and A/S/M are adjacent. They actually updates the map in the 2nd edition print run in which they added a border between CUS and A/S/M. See for your self here