Amount of merchant traffic makes it worthwhile in 1939. Plenty of target practice for the deck gun crews.
Unlike the stock game with GWX it's best to avoid the frequently encounter armed trawlers (530 tons). Trying to duel on the surface with the deck gun usually results in major damage to the U-Boat. Normally don't want to waste a torpedo on a boat that small. Best bet is to dive, go silent, and change direction to avoid.
Have a good sonar operator because it's common to detect two or three ships at the same time. Usually try to follow the single slow merchant contacts until the warships are out of range, then surface and move in for a deck gun attack on the unprotected freighter.
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