[duradil]

So..what I've pretty much gathered is this:

Ground up get your xv6800 or xv6900 phone working with GPS

*NOTE! Dont let customization run anytime! This means when you see the dialog on the today screen, peroform a soft reset.

Run 40 Vogue_unlocker.exe
Run RUU_Vogue_SPRINT_WWE_1.12.651.1_2.13.00_SPC_NV133_ Ship.exe
Run Vogue_unlocker_MFG_2.31.exe
Run RUU_Vogue_VZW_WWE_3.14.605.1_Radio_3.37.77_Ship.ex e
Run _HTC Touch (Bell)_RUU_Vogue_BM_WWE_3.09.666.1_Radio3.42.50_Sh ip.exe (contains latest radio update 3.42.50)
Run **any custom ROM you want!**

-----For GPS-----
Install WModem Drivers
Install QPST 2.7

Put Serf Telus aGPS.cab on your phones storage card (for later use).

On your phone, dial ##3424# This will put your phone in diagnostics mode, and terminate your active sync connection. If this is the first time on the computer, let it install the device properly before moving forward. This is also why we installed the wmodem drivers, it lets your computer see your phone as an HTC USB hub for programming.

If the today screen popped up, go back to active programs (normally from the list button in the upper-right corner of the phone) and select the DRM program.
Start QPST Configuration.
Go to the ports tab and select to make a new port.
Find the usb connection, which should be your phone.
Select Start Clients from the menu bar and select "service programming"
Select Ok.
Now select read from phone, and select Ok using the default "000000"
Click Save as in order to make a backup of the orig config.
Navigate to the gpsone tab.
Ensure all checkboxes are marked on the left side, and enter the following server inforamtion:

PDE IP Address: 216.198.139.92
PDE Port Number: 8889
PDE Transport: IP
Position Calculation: PDE

Exit the DMR app on the phone and perform a soft reset.

Run Serf Telus aGPS.cab

Perform another soft reset.

I don't have links to all the software, but jtuite's first post has most of that covered. This just sums everything up. I'm not trying to steal anyone's thunder, all of this information belongs to others who all deserve their credit.