Here's a pic:
http://img241.imageshack.us/my.php?image=garminondashrw2.jpgIf it's too dark, I'll try and take it again tomorrow. EDIT: I'll take some pics tomorrow in the sunlight, it'll be easier to see. I'll show the steps.
Like Airbalancer said, there is a round black disk that comes in the package.
(1) stick that on the dash where you want the GPS to be.
(2) suction mount the GPS "holder" to this disk (rather than to the windshield)
Let me know if you'd like some pics showing each step. I had no idea how to do this either until my husband fiddled around with it, and discovered how.
I place it in the small crevice where the clock is. This way, the GPS doesn't stick out too high on the dash. (I put it to the side a bit so it doesn't block the clock either.) Less blockage of windshield visibility compared to windshield mount.
Hubby bought a round sticky thing for the Camry dash and put it in the same place, and it works fine there too. I guess it might not work in some cars if there is no suitable crevice of some sort....
p.s. You can buy extra replacement disks and "holders" for the Garmin nuvis if needed.