Mods probably differ, but you can tell when they get radar detection. If you're 12 nms away and they come fast at you is one clue. With mods you can get radar detection with the APR1 unit, so you know what ships have surface radar, almost always capital ships and they will vector escorts right on top of you.
I almost always turn my radar off and check for a few seconds as needed after mid 43, although it may be 44 until they get it. I think it's possible the Yamato and a few capital ships have it earlier.
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