Evaluate Timing chain sets

Great info guys I'm learning!!
I have more popcorn to watch round two.
On the Crank Gear the Offset ability it gives to you. Why use it?
I am assuming that "if" your goal was an initial timing of 12 and you selected to install with a +8 the light would actually appear to show the timing as +4 ?
Is that right?
If so, what if another person checked your timing, wouldn't they be confused with the timing showing as +4 ?
:rolleyes: