OK, here's the situation.
I'm to measure a course (actually remeasure one whose certification is to expire shortly).
There's a calibration course just off the race course near midway. I'll be staying near the finish of the course (it's a point to point layout).
Although it doesn't follow the directions in the manual, would it be acceptable to ride from the finish to a midpoint and take a reading - detour to calibrate, go back to the midpoint and ride to the start, back to the midpoint, take another reading, detour and recalibrate, then ride from midpoint to the finish?
The entire ride should take a little over an hour, and will be done in the pre-dawn hours due to traffic, so there should be little temperature change, thus little change in the constant.
Thoughts and opinions appreciated.