TODO
-Power GPS some other way. When charging, it could be subject to up to 5V, which could kill it.
-Add filtering for the DRA818V
-Possibly add a mounting hole
-Battery monitoring technology. Most likely a zener diode into AREF, and the battery voltage directly into an analog GPIO pin. Arduino has an internal analog reference for 1.1V, maybe use that instead?
-Some way for the tracker to receive, rather than just transmit