Wow...was unaware that could be done. What brand/model of GPS receiver did you get?
Its kind of confusing, but i will try my best to explain.
I found most of the info here (1st page, 4th post), but had to modify a bit to get it to run
AZFJ › Forums › Technical Discussion › 4x4 Tech › Navigation Equipment
So the first thing to load is called basecamp, free from Garmin.
Next is mapsource, again free from Garmin.
Basically Base Camp allows you to use Mapsource, which is where u can upload all the cool topo maps that you download from the link above. I don't know why you need one to run the other but you do.
Then Nroute, this is the actual tracking software. So you can build a route in Mapsource. load it into Nroute and you are good to go.
The other way to build a route is by using Google earth, exporting as a KML file, then running that file trough some software called GPS Babel. Which will give you a usable file for Nroute.
Last is the actual receiver. I went and bought the one the show in the link, but could not get it to work with Nroute. So I tried my Garmin
eTrex Legend HC and it worked perfectly. It will work with my Garmin Nuvi GPS unit. The other cool thing is you can upload the topo maps to both these units too.
So all I paid for was the actual receiver. All the software is free. I'm sure there is different ways to set all this up but this is what works for me.
Hopefully it works for you and i didn't just blow your mind. :gun6: