I seem to have a lot of questions involving intermediate points, here's the latest. The Race Director wants to add a second start to an existing half marathon to handle the crowd. I know that correcting a course by measuring the old section, measuring the new section and swapping is frowned upon.
In this case, picking a common point and measuring the old course from that point to the existing start, then measuring a new route from that point to a new start at the same distance seems the same process, but is the only way I can see to add the new start without remeasuring the entire course.
Will I be causing waves by measuring an old section, then a new section to the same distance? The intermediate (common) point will be accurately located similar to the start and finish.
Additionally, I assume the correct process (if I measure the old then measure the new) will be to make a new map of the entire course. Should this map also show the existing (old) start? Should the new course with 2 starts replace the old?
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