Supoposedly ships are spawned in ports and given routes to an end destination. They're not supposed to just spawn randomly in the middle of the ocean. On a clear day you can almost see out to 10 miles/16 km - usually a gray sihlouette at that range. I think the 30 mile limit is a parameter set in the radar files and can probably be changed like torpedo launch depths. I'll ask Cobia how far out contacts show up on their scope.
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