Basically the charts are there to tell you how far your target could have travelled in kilometers based on their speed during a certain amount of time. "Stunde" means "Hour" in English. Min means Min.
So find your targets speed on the left side column, than read over to the specific time frame you're interested in or find the distance along the row and you can see how many hours/minutes it would take to travel that far.
So in the example below you can see that a "Slow" moving target, which means they are moving 2-6 kts, will take 3 hours to travel 33km if they are moving at 6kts.
Here's a basic translation of one of the tables:
Hope that helps!