L-1011 Navigation: Inertial Navigation System (34-43-5)

The INS system hardware consists of for components:

• The Inertial Navigation Unit (INU), which contains the platform and computer. 
• The Control Display Unit (CDU), which is essentially a remote terminal by which the crew communicates with the computer. 
• The mode selector (MSU), is a function switch for the computer.
• The final item is a battery capable of powering the system for up to 15 minutes in case of loss of ship's power.