EFIS AP I
EFIS with built-in single axis autopilot

Autopilot Features:
• GPS-slaved sold state DG
• Digital Ground Track Selector
• GPS Nav Mode
• Control wheel steering

EFIS AP II
EFIS with built-in dual two axis autopilot

Autopilot Features:
All feature of EFIS AP I plus Altitude hold

EFIS AP III
EFIS with built-in dual axis autopilot

Autopilot Features:
All feature of EFIS AP II plus climb and descend on vertical speed, Trim sensing pitch servo annunciates need for trim Altitude selector.

EFIS AP IV
EFIS with built-in dual axis autopilot

Autopilot Features:
All feature of EFIS AP III plus GPS steering, V-NAV, Vertical GPS steering (GPSSV)