Lift off the the GPS U.FL antenna connectors.

Remove a screw on either side of the GPS unit. These have very fine Phillips heads, smaller than 000. One of the heads may be covered with a black coating which should be scraped off

Remove the retainer clip which the screw on the right secured. The top of the clip is held by the board.

Lift off the connector which the clip retained. You can now remove the GPS unit.