1. You certainly don't have to use it. It's extremely useful to track a target over time and see if your solution appears correct. It also helps that it takes your sub's manuevering into account, which helps immensely because sitting at full stop is not realistic. I often use the PK to track a target, then turn it off at the last second and send bearings to specific parts of the ship, like O'Kane.
2. According to one of the devs in another post, you shouldn't have the PK on while taking measurements to be used with the auto speed/course estimation. After that, you can turn it on whenever you want. Once you have the speed and AOB entered, make sure to take one more range/bearing input and the solution that develops after that will be correct (within the error of your measurements, of course).
I highly recommend moving to no map updates once you feel ready. The process of estimating a solution, then using imperfect methods to verify it and refine it as the target approaches is one of the most enjoyable parts of the game. This is where using the PK to track helps a lot.
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