Remove the external antenna, GPS cover, and GPS module.

Use a pry tool to remove the white outer cover. Pry towards the front of the device. Continue prying down the length of the cover until it pops off.

Locate and remove the four Phillips screws

With the cover removed you now have access to the circuit board.

Using an 8mm socket you can remove the antenna pigtail.

Release the clip indicate to remove the circuit board.

Here is the circuit board fully removed.