Mapping Nebraska

I've just spent the last two hours mapping the first 105 miles of the Nebraska portion of the run. Having learned my lesson during the Colorado mapping exercise, I tackled the exercise fully equipped with:

• a hardcopy Nebraska map from AAA,
  
• Google Earth - which has the best road detail I've found so far and provides GPS coordinates - but doesn't provide the ability to save a route (that I've been able to find)
• mapmyrun.com - which does allows one to save route - but you've got to do it in increments (the last time we decided to create routes in 105 mile increments)

So, I started plotting my way through Nebraska, saved at 45 miles, brought the map back up, asked to edit it, continued on through 105 miles, pressed 'update' and was told I didn't have permission and !poof! miles 45 through 105 of the Nebraska route were gone. Arggghhhhh.

Fortunately, I had written down every 15-mile section of the route including the roads followed and description and coordinates of each 15-mile end point so it's not been an entirely wasted effort.

I sure would like to find a more robust mapping tool, though - one that provides map and satellite image graphics, can handle a long route (ultimately 1500-1800 miles), shows mileage as the route is laid out, allows marking of 15-mile segments, offers road name details and GPS coordinates, and accommodates saving and editing. Not asking for too much am I? Does anyone know of such a tool?