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In general, the notepad device for determining target speed is only of limited use. It's worthwhile learning additional techniques such as the Three Minute Rule to accurately detect your target's speed.
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I think you should take this bit right there as being most important. I don't think anyone uses that stopwatch thing for determining the speed of a target. Its buggy, inaccurate and altogether cheating when it comes to th challenge of manual TDC.
The TDC computes based on certain variables the solution. The relative speed between you and the target is nothing youneed to worry about. Just the target's speed needs to be imputed.
The three minute rule is the most reliable way I've found to do it. It also takes effort and practise so its worth it.