Are you using the 3 minute rule w/ your radar? Radar jumps (because it's sweeping). The timing of the jumps is likely the cause for the error. But, as he said, at the ranges you should be shooting at (1,500 tops), 1 knot of error in speed is nothing.
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*While troubleshooting a printer at work
Me: "Do you want me to run the copies through again?"
Boss: "Hold on, let me go get the alcohol first.
Me: 
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