Yes SER does contain timestamps for each frame. Looking at code QHY driver does decode GPS info from camera but this doesn't seems to be passed down when recording SER stream. Only current PC time is used. Maybe "StreamManager" class could be modified that it scoop up this GPS timestamp.

Are you doing asteroid occulatations timing? I was experimenting with that and when I recorded GPS LED blink with my camera I found out that timestamp in SER file was within 5ms of blink start. I used chrony NTP client to keep my clock in sync. Doesn't that QHY cam burn timestamp into image?

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