Which is great, as long as the actual application you are writing is small or amazingly efficient and a GPS tracker is unlikely to be small and making it amazingly efficient is going to require you to forego the standard GPS libraries so you can parse the data stream as it comes in as holding a whole line in memory is going to hurt.
If you ONLY wanted to read a temp/humidity sensor, that would be feasible but less ideal as the classic LMIC that does fit is only just TTS v3 friendly.
So all in all, best get yourself another board - if you need it small, I hear the Teensy’s are good.