Quote:
Originally Posted by Sentinel VI
Realistically, a Type VII u boat only had a visual range of about 6.6 nm, or 12.2 km.
Obviously, the advent of marine radars greatly increased detection range to over the horizon.
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That's the distance to the horizon, isn't it?
Lookouts could often spot a ship beyond the horizon by masts or smoke plumes. I've heard that spotting ships at ranges up to 15-20km were not outside the realm of possiblity by looking for these things.