The C4000 provides a small frame capable easily fitted into a radio stack.  Gives Heading Hold Control – Intercept and Track VOR/LOC – Back Course – fully coupled ILS Tracking Built In GPS steering capability – Attitude Hold – Pitch attitude modifier control – Altitude Hold – Glide Slope capture and tracking – Vertical Speed Control - Voice Notification for Trim Function and AP Disconnect – Auto Trim and Manual Electric Trim – Trim Prompting (for system without auto trim) – Flight Director Capability – Yaw Damper Control.