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TROUBLESHOOTING
Cosine Error
This off angle speed measurement error is referred to as the COSINE
error, named after the mathematical function that allows you to calculate
the exact speed versus angle. The measured speed will always read
lower than the actual speed as you move off the centerline of the path
of the moving object. For small angles, this error will be very small. This
is why you see police officers pointing their radar along the direction of
the road; not down a side street pointing sideways to the road.
Each degree from center will cause your speed to read the noted % lower.
