Apples & Oranges - Beware! | Road Course Measurement Forums

jimgerweckMember

I measured a course this morning. Rode 2 towns away to meet the race organizers near a cal course I'd laid out. Calibrated, did the 2 rides, then realized there was another cal course right near the finish of the race course, and by using that I could head directly home instead of stopping halfway to re-calibrate.

Did the first ride and instantly realized something was fishy. My pre-cal constant was 142.85 (using the Protegé method). Post-cal was 145.10. Then I realized the post-cal course was 1,000 ft., while the pre-cal was 300m.

This second course was originally laid out by another measurer in the state who thinks Imperially rather than metrically. When it was paved over, I laid out a 300m course in its place. The road was repaved AGAIN and this time the other measurer laid out a 1,000 ft. course.

The lesson is, don't assume a cal course is 300m (or 1,000 ft. for that matter).

8/21/111:16 PM

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jaywightCertifier

The corollaries to this could be:

A few years ago an experienced measurer calibrated on a certified calibration course in downtown Chicago and thought that the 300 meter calibration course was 1000 feet long. The measurement was one of those last-second affairs and, predictably, resulted in a 9842 meter 10K course.

I contacted him immediately after I discovered the error- but at this point don't recall how the issue was eventually resolved...

8/24/111:17 PM

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