Datasheet

FIX is an output pin - it is the same pin as the one that drives the red LED. When there is no fix, the FIX pin is going to

pulse up and down once every second. When there is a fix, the pin is low (0V) for most of the time, once every 15

seconds it will pulse high for 200 milliseconds

PPS is a new pin output on V3 modules. Its a "pulse per second" output. Most of the time it is at logic low (ground) and

then it pulses high (3.3V) once a second, for 50-100ms, so it should be easy for a microcontroller to sync up to it