At first sighting, I mark the position on the map.
accelerate time for a while, make second and third marks on map.
use the "ruler" and draw a straight line through those marks and that gives me the targets coarse. At that point I run a paralel course at flank speed untill I'm about 10 km ahead, do a 90 turn into the target coarse and run on the surface untill I'm about 3km from intercept point. Submerge to periscope depth at 1/3 untill I'm 1km away and wait.
I do a visual inspection, look for guns on the target. Large ships get at least one fish, try to hit fuel bunker or break the keel. sometimes second fish needed to stop it. small ships get one fish, unless trawler/tug/fish boat, dont waste ammo on those little ones. most ships that survive one or two torpedoes can get finished off with deck gun.
NOTE: If ship has guns, surface on the other side of tilting deck, guns can't tilt down low enough to hit subs !
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