heads up display
In Orbiter, the heads-up display is a standard feature of all spacecraft. It has three modes, cycled by pressing the H key; it can also be turned off completely with ctrl-H.
- General information
All HUDs show the current time and camera information in the top right-hand corner. In non-panel modes, they also show engine and RCS status in the top left-hand corner.
- Surface mode
The HUD displays a pitch ladder and a cross-in-circle indicator of the current velocity. (If this overlays the ground, it indicates your projected landing point.) At the top of the HUD is a bearing indicator; this is centred on the vessel's current heading. If a base has been selected in the Map MFD, the direction to that base will be shown as a triangle, either overlaying the bearing strip or pointing off to one side of it. Airspeed and altitude are also shown.
- Docking mode
This mode displays direction and velocity relative to the selected docking target (normally chosen with a nav radio). A box surrounds the target (or a triangular pointer shows the way); a cross-in-circle shows your velocity vector, and a cross shows the opposite vector. You can change the reference navigation radio with ctrl-R (which will also cycle through other docking modes; see the manual).
If you want to match velocity with the target, apply thrust towards the cross.
If the reference radio is tuned to an IDS transmitter, the HUD will show a series of rectangles aligned with the approach course for the docking port.
- Orbit mode
This mode displays a pitch ladder relative to the current orbital plane, where the zero line indicates the orbital plane. It also marks the prograde direction with a cross-in-circle and the retrograde direction by with a cross. (If neither of these is on screen, a triangular marker points towards prograde. You can change the reference object with ctrl-R.