It seemed like a great idea. The iPad has an optional built-in GPS and you can download some great navigation software for use in automobiles. With its big display screen, an iPad should be a much better GPS than the present device I have with a small screen. Should be... It didn't work out that way.
I purchased a RAM mount for the iPad. It looks like most of the other mounts included with GPS devices, except that it is bigger than normal. The RAM mount has a suction cup for attaching to the windshield, a short arm that holds everything over the dashboard, and a clip-in mount for the iPad. It was a bit expensive at $38.84 from Amazon, but I have other windshield mounts made by RAM and have always been impressed how well they work. They never fall off the windshield in the hot sun.