Yes, if America decides to try and move through SZ 60 with those ships in the combat movement phase, they will have to stop and engage the defending enemies. However, if you clear them out and then try to move your ships through on non-combat they can sail through.
Sea Zones and Islands
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Could I move a USA fleet through sea zone 47 without conquering New Guina?(leaving the 1 Japanese Infantry) on my way to sea zone 48?
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@gbb8brm Welcome to the forum :slightly_smiling_face:
As long as the seazone that surrounds the island does not contain any blocking enemy ships it is friendly and may be passed through. The seazone is not part of the territory.