It looks like the official Verizon Wireless ROM update is here for the XV6800
This is supposed to update the operating system to Windows Mobile 6.1
It also adds EVDO Rev A capability.
The old ROM is version 2.09.605.8
and the new ROM is version 3.57.605.1
Unfortunately, GPS is NOT enabled for you to use on other applications like Google Maps, TomTom, etc. Hence, if you wish to use your phone as a GPS navigator, then you better learn how to install a custom ROM.
Go here to download the upgrade: