Thanks a lot Tycho, I've now modded the slide rule into my game

Here's one small thing you can do with it:
Kilometers to nautical miles (SM = Seemeile, nautical miles in German) conversion with one quick turn of the inner ring. Quicker than using a calculator

What's more with DR3 I don't even need to remember the right conversion number
The same with meters/second to kilometers/hour conversions.