| Mark,
The quick answer to your question is yes, handhelds are accurate enough to do 
that job. I work for the DOT here in AlberDUH and use a Megellan 315 quite a 
bit. When I'm out on the road logging a trip I can see the separation in the 
driving lanes between going to and from a destination. If you have a good lock 
and plenty of satellites, you should be able to get sub meter (ok, foot!)
accuracy in the horizontal. Vertical sux.
A cool feature I use is with scanned an airphotos registered within FUGAWI 
software. I take the laptop out in the field with me so I can locate features 
on the ground while essentially viewing them from way up there. That might work 
quite well for laying out a racecourse on the airphoto then putting the cones 
exactly where you want them on the tarmac.
-- 
Marcel Chichak    chichm@telusplanet.net 
        Edmonton Alberta Canada, eh? 
  Peek into my world: www.telusplanet.net/~chichm
  also visit www.shell-4000-rally.org
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