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mapper.acme.com is the bom!

Of the three, ACME is by FAR the most useful! I'm so happy someone finally did a non-advert USGS site.

andy
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Viva la ProleRalliat!
 

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what are the maps based on?

When using maps it is important to understand that while the maps may be somewhat new, the air photos that they are based on are often very old. Many of the topos available in the lake states are based on air photos from the 30s and 40s.

I can think of a number of corners on rally stages where road construction or repair has made the route different than it would appear on the maps.

Be careful you aren't out there driving with full confidence in what may be 70 year old, obselete info.
 

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A lot of the larger counties in the US will have an online GIS. Some will have Quads, aerial photos and 10/20ft contours amongst other fun information...

example: Washington County, Oregon (Oregon Trail)

http://www.co.washington.or.us/gisaps/cfdocs/gisweb/

The best way to locate the GIS is to know the county name & google it! This is a great way to investigate the area prior to an event.

Happy Mapping!:)
 
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