This Google Map shows your 100 Mile, 100K, and 50K start and finish lines.  It also shows all of your Aid Stations and water stops.  Click on the icons to see what's available at the different locations, as well as crew instructions, in the description.

The Alternate Route Driving Map includes driving routes for relay teams and your crew and aid station access info so that everyone is ready for race day. Please take a look at the map and instructions below so you know where cars can (and can’t) go.

There's more information on the Crew page.