On the real world Shuttle, which units are the 'velocity' targets defined?
My first assumption was they are in KEAS, but it is possible that they are in qbar units which are based on the square of the ft/s speed and the relative density.
These are reasonably close to each other, but there is a small difference between them, with qbar giving a slightly higher speed for the same numeric value.
While most of the flight instrumentation in particular the HUD gives KEAS values, the engineering limits are usually defined in terms of qbar, and this is included on the VertSit display IIRC.