Earth Orbit Insertion (EOI) Monitor, a program in the command module computer.
LGC Approach Phase program.
LGC Landing Phase (Auto).
LGC Landing Phase (ROD) program.
LGC Landing Phase (Manual) program.
Program Change Request.
The point in an Earth orbit where the orbiting object is closest to the Earth's center.
Primary Guidance, Navigation and Control System (pronounced “pings”). The inertial guidance system in both the Command Module and the Lunar Module.