An advanced version of C-4.
C-4 block1 has a completely updated cockpit which is equipped with a HUD and an AG panel. It also has a larger cabin and a new power system which removes the assistant engines and uses 6 Blasto J90 instead of original 2 Blasto BFE300 to increase reliability. Its exterior also has some slightly changes.

Instructions:

AG1: Control the cabin. Pull down VTOL to open the cabin.
AG3: Navigation lights.
AG8: HUD.
Trim: Pitch Trim.

HUD:

Ground Proximity Warning: Be activated when the relative altitude is less than 75m.

Pull Up Warning: When the relative altitude is less than 200m and the plane’s pitch angle is less than -15 degree, it will quickly blink to give a warning.

Speed Vector: Indicate the plane’s current speed direction. By comparing the location of speed vector and the horizon, you can evaluate the plane’s vertical speed. Speed Vector can also help you to indicate your glide slope when you land.

*C-4: https://www.simpleplanes.com/a/9mc0a2/C-4