Race Organization: Course and Course Measurement
There is a special tool called a Jones Counter which is attached to a bicycle and calibrated to a mile, or fraction of a mile by riding that accurately measured distance. Riding your racecourse and using the Jones counter on your bicycle, you can accurately measure your racecourse. I am sure there are many racecourses that are measured by driving them in a car and using the cars odometer, but this not generally admitted to. Most common distances are 5 kilometers or 3.1 miles, 10 k or 6.2 miles, 5 miles, 10 miles and a half marathon 13.1 miles and of course a marathon 26.2 miles. A popular course tool is the Gmaps Pedometer

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Sample course certification
http://www.hudsonmohawkrrc.com/NY11057JG-1.pdf
Which is more accurate: A certified course that is wheel measure
In GPS We Trust is a great article on course and course measurement using both a GPS and Jones Counter.
http://www.hamptonrockfest.com/hamptonhalf-GPS.html
http://www.riverregionrunners.org/html/gps_accuracy_article.html
USATF Road Running Technical Council
http://www.rrtc.net/
extra large display chronometers
I am looking into buying one of those extra large display chronometers to have at the end of a race but cannot find them. Do you know where I could purchase one?
Thank you,
Gustavo
Courses
America's Running Routes
http://www.usatf.org/routes/map/
http://www.usatf.org/routes/map/
http://www.walkjogrun.net/
http://www.gmap-pedometer.com/
http://www.mapmyrun.com/
http://www.usatf.org/events/courses/certification/tools.asp