Why does Quantum display 'Uncorrected' if APEX or ULTRA is stable?

From time to time it may be observed that while a APEX/ULTRA solution is stable, an 'Uncorrected' solution is displayed at the bottom left of the Quantum display:

Quantum main display with uncorrected highlighted

This uncorrected status appearing at the bottom left of the screen refers to the back up solution and not to the active (output) solution.

However, if the APEX/ULTRA solution remains steady in this state for a prolonged period, then this uncorrected solution may be an indication that while the VERIPOS services are being received there are not any reference stations available within 1500km of the vessel.

This may be observed on vessels which choose to use more than one correction beam for the purpose of redundancy; as one of the selected beams may not be transmitting corrections from a station within the 1500km range of the vessel.

The Correction Age tile can be used to determine if the correction data for Standard is being received, as this indicator is based on all station data not just stations located within 1500km range.