![]() ![]() Please realize that connecting a consumer-grade (designed for location, not for time keeping) GPS unit over USB serial does not have the accuracy of “proper” GPS synchronization due to significant and inconsistent delays in the serial line itself, as well as in the USB system. ![]() Most GPS-sync is done through GPIO interrupts off the PPS output directly. This approach may be off by hundreds of milliseconds. There is significant delay in the serial-to-usb and usb-to-data connection.
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