H3 Navigation

[Statella43]

Hello everyone I recently purchased an OEM H3 navigaiton. It did not come with any Navigation disk or antenna.
1. What is the difference in Map disk versions? (ex- 3.0, 4.1, and so on) do I need a specific one for my nav unit, or will anyone work?
2. Will any GM nav antenna work or do I need a specific one? (I already was told some alterations will have to be done to the bracket to make it fit)
3. I plan to later install a back up camera, is their any other way to do this other than purchasing a PAC VCI-GM camera interface?
* If you have any information reguarding any of these topics please post it or you can e-mail me at Statella43@yahoo.com Thanks in advance for any help!