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GPS-video-OBD sync

I've tested last weekend RaceChrono with a good external GPS (my phone gps is useless). I have used a TomTom Bandit camera for recording the video and a cheap OBD reader for car data.
I have synced the video with the GPS data without a problem, BUT the OBD is about 3 to 5 second earlier then GPS/video.
Is there any way to move it?


  • aolaol
    edited May 2018
    Hi, device independent time shift filter is on my TO-DO list, but currently there's no way to do it. Normally GPS/OBD-II sync should be within 300-400 ms, so for most people it doesn't matter. Which GPS did you use, 3-5 seconds sounds like a lot, maybe some issue with the Bluetooth stream maybe?
  • I've just checked and the OBD data is about 6 second earlier than GPS
    The GPS is a custom module based on ublox VK2828U7G5LF chip with a serial to Bluetooth converter, but also with another external gps (I don't remember the brand, it was borrowed) I got the same 6 second delay.
    Using the internal GPS the sync is very good
  • Sounds weird that both GPS have such long delay. RaceChrono joins the feeds from the two sources based on the reception time, so clearly the GPS feed is received with 3-5 second delay you mention. Usually the delay on GPS is maximum one second. There's some delay on OBD-II too, but usually only 200-300ms at max.
  • I've checked an old session (made with the free app) with internal gps and the data are perfectly synced, so maybe there is some problem with the bluetooth communication between my phone (Huawei P9) and the external GPS.
    Thanks for the support!!!
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