Dogwood Dash 5K

I drove and hour and a half east to Woodville to run the Dogwood Dash 5K this morning.  Nice cool and clear weather.  I finished in 34:25, but my GPS said that the course was exactly 3 miles.  My friends came up with the same distance.  I have never run this race before, but it has been around for many years.  Why can't race directors accurately measure their course?  In any case, I was first in the 70 and over age group - and there were three others in the age group.  I walked around the Dogwood Festival for a while and got back to Huntsville by 1 p.m.