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Step 1
Turn the radar gun on.
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Step 2
Position yourself so that there's a clear path between you and the vehicle you want to clock. Radar beams travel in straight lines and cannot function around curves, hills, trees, cars or other objects.
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Step 3
Position yourself so that there is one mile or less of distance between the gun and the object whose speed you are measuring.
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Step 4
Position yourself so that you'll be in line with the object's motion when you shoot. Using a radar gun from the side of the object does not produce accurate results.
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Step 5
Stand completely still while using the radar gun. Any movement can interfere with the radar beam and cause inaccurate results.
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Step 6
Try to use radar guns during sunny weather. Although rain and fog do not interfere with the accuracy of radar guns, they do reduce the range. When using radar in inclement weather, move closer to the object you are measuring than you normally would.
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Step 7
When the object has passed you, look on the radar gun display and locate the "Target" number. This is the speed of the moving object.
