[CapnScurvy]

No, we're talking about the same thing. There's times when you start the Stop Watch (pushing down the stem), you'll want to stop it at a certain elapsed time to check the targets speed by measuring its distance traveled during that time. By using the game pause key, you'll stop the watch....and the game itself, to check something (like how far the target may have traveled on the Nav Map, provided you marked the targets position when you started the watch). By not using the stem to stop the watch, you won't return to zero the next time you un-pause the game. This allows you to keep a longer elapsed time going on the watch.....which will provide you with a more accurate estimate of target speed when plotting its traveled distance on the Map. The longer you follow the target, keeping track of its relative position to the sub, and plotting its position on the Nav Map, the greater the accuracy for both gleaning AoB or target speed.