As far as I can tell, they will fire upon you if they get a solid contact (meaning you are close).
Regarding speed ... these days I travel at any speed up to 10kts without worrying about it, since someone had produced a chart showing that object noise amplitude is constant from 0-10kts in SC. It only begins to increase beyond 10kts.
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War games, not wars! --- Only a small few profit from war (that should not stand)!
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