If you want to practice on the missions I use in those videos, here they are below.
Day:
https://drive.google.com/drive/folde...aXMDjsvvGRFeV3
Night:
https://drive.google.com/drive/folde...n_IlXwqs1lI_-k
Drop those folders into C:\Program Files (x86)\Steam\steamapps\common\Silent Hunter 5\data\SingleMissions
To start with I would get comfortable with the attack disk (the “front side”). Don’t bother with the back side, at least at first. The methods I show of data gathering are pretty simple, to where you don’t necessarily need the back side for calculations.