@Docedison
The Arduiniana page says: "If the $GPRMC sentence reports a validity of “V” (void) instead of “A” (active), or if the $GPGGA sentence reports fix type “0? (no fix) then those sentences are discarded."
I'm not sure if this is what the error counter is keeping track of, but even if the invalid data is being discarded, I still think it is a problem if I cannot find other invalid data.
@PaulS
Hello from another Seattleite! The GPS updates every second, whether it has data or not. I'll try fiddling around with that loop later in the day, thanks!