The nets were originally added as a substitute for missing reefs since SH has no reefs in my old campaign mod. Lurker used that chunk, then added even more of them for RSRDC. A subsequent mod added a few "reefs" as terrain changes (shallows), but the nets are still required in many cases an an analog for reefs.
If you find a RL map of the various islands, and see where the passes are in the reefs, you'll have an idea where the enemy ships might exit.
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