So, with your code all confirmed as working, it is time to pin your tracker to your top (try to make sure the ceramic aerial has a clear view of the sky), and go for a walk or ride. You should quite quickly see the FIX LED get a connection. Once you do see the FIX indication you know that your tracker is logging away for you.
When you finish the route you want to log, just press and hold your power-off button to switch everything off. When you return home you can copy the KML files off your Pi Zero as before and upload them into Google Maps or Google Earth to share your routes!
Here is an example of a route tracked with my Pi Zero GPS tracker seen in Google Earth:
