There are only very few ships around in early 1942. It gets much better later in the war and you should be able to find plenty of unescorted merchants.
The TDC works, but you have to calculate the target speed yourself (The TDC can not track a target for you like a radar can, you have to give it all the input like speed, angle of bearing and distance before it can start to compute your torpedo solution and track the target. It also only works as long as the target stays at the same speed and heading).
The easiest way of getting the speed of a target is with map updates on. Just mark your target on it and start the timer. After 3 minutes mark the target again and measure the distance between the two marks. If the distance is 1200 yards then the speed is 12 knots. 700Yards = 7 knots and so on.
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Putting Germ back into Germany.
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