How do you use a rotating bezel on a digital watch?

The rotating bezel can be used to measure elapsed time. For example, if the time on your watch reads 10.10, align the zero point of the bezel with the minute hand. Now, say the time is 10.40, the minute hand at 8 o'clock will point towards 30 on the bezel, indicating that 30 minutes of time has elapsed since 10.10

Simple?