GPS cover is used to increase the surface of the GND of the GPS module and isolate the GPS from other electronic components on the drone such as flight controller, ESCs, power cables. By using this cover we can improve the GPS signal reception.
The GND of the GPS module has to be soldered onto the copper of the cover.
The MT3329 can be connected to the cover by soldering 4 pins on each corner on the board. The 6 pin cable goes through the hole under the board. This is a very clean design.