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You can easily calculate the speed using the formula below to create such a chart in excel
true_speed = radar_speed / Cos(angle)
Edit: Corrected typo caught by memtek
__________________ All of my posts should be treated as my personal opinion or imagination. Any potential resemblance to actual facts, persons, products, or objects is purely coincidental.
"It is difficult to get a man to understand something, when his salary depends upon his not understanding it!" – Upton Sinclair
You can easily calculate the speed using the formula below to create such a chart in excel
true_speed = radar_speed * Cos(angle)
Nope, I'm sure it was a typo on your behalf. Correct is:
radar_speed = true_speed * Cos(angle)
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__________________ All of my posts should be treated as my personal opinion or imagination. Any potential resemblance to actual facts, persons, products, or objects is purely coincidental.
"It is difficult to get a man to understand something, when his salary depends upon his not understanding it!" – Upton Sinclair
It basically means that unless a LEO is standing directly in front of a speeding car (0 degrees), the speed the gun will show will be less than what the car is actually doing.
For example, if the car is doing 70, and the LEO were standing 60 degrees off the side of the road, the gun will read 35 MPH. If he were standing 20 degrees, the gun will read 65.
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Lidar Cosine Effect 
ops: We can only wish it read that, huh. 
