on-the-fly manual targeting questions

I've recently begun using manual targeting, primarily doing manual data entry into the TDC. I've had good success if I predict a target's path using the navigation map, set an ambush point and park my sub ahead of them, and then figure out what the calculations will be when they hit a certain point on the map. Then I can take plenty of time to calculate and enter the values; I just keep the TDC set to manual and launch when the ship reaches my ambush point.

I want to learn how to do this on-the-fly, when I don't have the luxury of setting things up ahead of time. However, I feel like I'm not fast enough entering the data, and that I'll get imprecise targeting as a result.

I should be able to calculate and enter target speed at my leisure, but then it seems to me that bearing, range, and AOB all need to be determined and entered at a precise moment in time. Of course, I'm only human, so it takes time to work these out with the map tools (or with the periscope notepad, for that matter). But, how can I be precise then? I mean, if it takes me 60 seconds to gather the data, whatever I calculated first will be 60 seconds old/wrong by the time I get it all entered into the TDC. It doesn't help to enter one value at a time, because the automatic tracking is worthless until all four dials are set correctly.

Thanks for any tips or advice anyone can offer on this.

I'm also curious about the capabilities of the automatic tracking that the TDC can do. As I understand it, the TDC attempts to predict the ongoing path of the ship and adjusts the bearing, AOB, and range dials for each new predicted position. But does this take into consideration the movement of the submarine? Does this take into consideration any course changes made by the submarine?

Thanks!