ZED-F9T - Integration Manual
Figure 3: Flowchart of the static hold mode
3.1.7.5 Freezing the course over ground
If the low-speed course over ground filter is deactivated or inactive (see section low-speed course
over ground filter), the receiver derives the course over ground from the GNSS velocity information.
If the velocity cannot be calculated with sufficient accuracy (e.g., with bad signals) or if the absolute
speed value is very low (under 0.1 m/s) then the course over ground value becomes inaccurate too.
In this case the course over ground value is frozen, i.e. the previous value is kept and its accuracy
is degraded over time. These frozen values will not be output in the NMEA messages NMEA-RMC
and NMEA-VTG unless the NMEA protocol is explicitly configured to do so (see NMEA protocol
configuration).
UBX-19005590 - R01
3 Receiver functionality
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