We'll need a set of wires to connect the slide switch to the GPS FeatherWing. I suggest using a 4-wire ribbon cable to keep the wires bundled together. The slide switch only needs two wires, so we can peel off a 2-wire set from the ribbon cable. The wire set should be at least 78mm (3in) in length. Using wire strippers, remove a bit of insulation from the tips of each wire. To make it easier to attach the wires to the pins on the switch, apply a bit of solder to the exposed stands of wire.
I suggest using third helping hands to secure the slide switch while soldering. The slide switch only needs two pins wired, one middle pin and either the far left or right.
The two wires from the switch need to connect to the EN and GND pins on the GPS FeatherWing. I suggest using a vise to secure the PCB while soldering. Solder the two wires to the pins on the bottom of the GPS FeatherWing PCB – This will make the assembly easier once we secure the PCB to the 3D printed enclosure.