Information Timestamp jumps in magnetometer data

Magnetometers may very rarely record a jump in GNSS-based (GPS, GLONASS, etc.) timestamps, of a few to several seconds, either forward or backward.  This is more likely when the instrument is using GLONASS (GNGGA,GNRMC) positioning data than when receiving GPS (GPGGA,GPRMC) data, and when it occurs this behavior should only occur once; the system will not jump back and forth.

This happens very rarely. Geometrics has verified only one instance of this behavior in Geometrics instruments, but our research shows that it is a known issue with the internals of some satellite navigation systems, and it may have happened in additional cases. If you observe this behavior please let Geometrics know; the issue doesn't currently have a solution, but we are researching options to identify when it occurs.

When this anomaly occurs, only the timestamp is incorrect; magnetometer and location data remain uninterrupted and correct.