Not sure if this is a bug or not, but since the latest OB (11/18/2020), the HUD symbology has changed for displaying altitude.
When in Alt BARO mode I get two numbers on HUD
XXxxx (presumably the baro alt)
RXXxxx (presumably the rad alt) - this changes to DXXxxx when over 5,000ft
When in Alt RDR mode I get just the second number (RXXxxx or DXXxxx)
1. Is this correct?
2. What does the D mean, and how does it keep calculating the radar height when over 5,000ft?