Slope-distance reduction on the HUD A-B card.
Verify: HUD tab, mark A on the base and B on the top. Enter 50 in the distance field, tap SD. With A pitch about -10 deg and B about +20 deg, Horizontal distance reads ~49.2 m and Estimated height ~26.6 m. Switch to HD: height becomes ~27.0 m (the old behavior). Reset clears the number but keeps HD/SD.