Quote:
Originally Posted by Immacolata
I just never got the hang of that Position Keeper. How does it work? What is the point of it?
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Next to the Norden bomb sight it was one of the best devices of WW2. The name means exactly what it does. It keeps relative position of your boat to the target vessel done through your inputs on the TDC. It is done mechanically. Those inputs are range, speed and AOB. If your three calculations noted are close to dead on, the position keeper will show with outlines of your boat and target vessel on dials. Each dial moves according to your inputs and continues to move each dial after it is turned on. Unless you or your target changes course the position keeper allows the user to predict with certainty the position of your boat to the target generating optimal view to a sinking. Keep in mind that once the three critical inputs are established and entered the scope does not really require to go up for a look anymore. Just watch the position keeper. The device also changed the gyros in the torpedos real time via the TDC. It is quite a clever device.