In a message dated 7/20/2009 6:09:49 AM Eastern Daylight Time, measurer@rogers.com writes:
Gene,
What is the RRTC's position on calibration courses measured by a laser? The last I had heard is that this procedure is accepted if the procedure was done by a qualified (certified to use this apparatus) person. The measurement was done at least 3? times and this distance was the shortest of the values obtained. The distance, name of the individual, name of the apparatus used were all to be stated in a letter on company letterhead (engineering firm). Is this basically still required?
The reason I am asking is that I have a group who puts on races and they are now branching in to measuring. They however have decided to purchase a laser to measure their calibration distances and I am wary of these "black boxes" in the hands of non professionals.
Pete, is this a question that should be added to the RRTC Bulletin Board?
Bernie
Dear Bernie,
A full-dress laser measurement rig like surveyors use costs several thousands of dollars. I suspect the rig your people are thinking about is a cheaper consumer model, which I don't trust, as the accuracy is not known aside from what the manufacturer claims.
I don't see the necessity, as a 300 or 400 m calibration course can be taped in half an hour or less. Moreover, the accuracy is plenty good enough for road course measurement purposes.
I'll put this exchange on the BB and we may see other opinions.
Best, Pete
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