TDC updating newbie question

[Zosete]

Hi there. Been watching this forum for years, and finally I decided to try GWX as my first SH3 experience.

I play with manual targetting but I haven't unchecked the WO yet to compare my measures to the accurate data.

I don't understand how the TDC updates. I make all my calculations on the map and enter them manually. The notepad is too cumbersome for me and the speed values it returns are always way off...

I set the values, then I turn the TDC auto on again. The target is locked in my uzo/periscope... but the values don't change. Sometimes the AOB updates itself (poorly), but the distance meter always remains the same.

What am I doing wrong? The only thing I set on the notepad is the ship type, just in case. Do I need to have some values set on the notepad? I've read the manual and it recommends entering yourself the data in manual targetting.

As it stands right now, the only method for me is making calculations just before firing. Everything I set in advance is a waste of time and another chance for the target to spot me. I'm sure I'm doin' something wrong. I've tried going back and forth to the periscope with a lock on the ship, but nothing.

Thanks in advance.