It was better when the facility was called 'obscuring time', because that was teh time that any beacon was 'obscured' or not visible.
Thus for a circuit with a 35 second lap and three bands on the circuit, the last 10 seconds from the first you can either use 3 bands and a low obscuring time or you can select one band and an obscuring time of 25 seconds.
In the first case the unit will pick up all three bands and give you lap time and three 'split times', in the second case it will give you a single lap time.
What you cannot do is set 3 bands and an 'obscuring' or minimum time of 30 seconds because the system probably will not pick up the same band each time, thus giving you a variable length lap.
The other problem is that if you set a long obscuring time to get only the one lap time per lap, and then dawdle or have problems between bands, the system may pick up the next band and count it as a whole lap.
Other wise, it's easy.
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