Yes, Honeywell Sales Bulletin 2011-26 enable the KI-825 to display WAAS vertical deviation when GPS is selected as the nav source. Connection to a WAAS GPS receiver is required.

The upgrade enables the KI-825 to display vertical and lateral deviations when the active sensor is WAAS GPS. This allows the autopilot to be coupled to the KI-825 display when flying an LPV WAAS Precision Approach. The upgrade also enables autopilot outputs and display of lateral deviations and vertical guidance when on other types of WAAS GPS approaches.