[creepy]

I recently downloaded a free application called AmazeGPS. It's does recalculate routes and provides voice naviagtion, but the loading of maps takes a long time because they are very detailed.

The good thing about AmazeGPS is that it is absolutely free.

Give it a try to see if it meets your needs.

Update - I just reread your post and see that you have an 8700. I didn't see that model listed under the AmazeGPS website. Maybe somebody else got the program to work with an 8700...