I'll give it ago, though 1200-1500m is very short, and would allow for alot of error. Im finding im having to take shots at 3000m+ even in the dark.
That said, its the radio messages of "Submarine sighted" that are causing me to take immediate action at range, though i've not noticed the convoy's speeding up and veering off once they have "indicated" they have seen me!
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