As it's not possible to have my Android phone physically connected during my recording sessions, I log sessions as an NMEA file from a USB GPS (BN-808) onto a small data-logger for the purposes of importing into RaceChrono Pro version 5.4.4 afterwards. The GPS has been flashed to update at 5 Hz and this frequency is representative within the NMEA file. The session NMEA file was created using the gpsd utility gpspipe and contains RMC, GGA, ZDA and VTG sentences.
I select the NMEA file within "experimental devices" successfully and run the session in RaceChrono and it imports without error on my Android device.
Unfortunately, the lap times shown for sessions in RaceChrono appear to be out consistently by a factor of 4, i.e. the lap times shown in RaceChrono are slower than the real lap times. Similarly, the session duration shown in RaceChrono is 4 times longer than the real session duration.
I see from a previous forum message from @aol
) that the NMEA debug import function plays back at 4x speed - is this play-back factor of 4 connected to my issue?