It is my understanding that the AGC is the computer within the PGNCS. Terminology varies, as the last link below from NASA notes. So far as I can tell, the AGC

It is my understanding that the AGC is the computer within the PGNCS. Terminology varies, as the last link below from NASA notes. So far as I can tell, the AGC maintained the state vectors for the KF. Ground control would run batch mode least squares solutions, and pass it on to the LM, where the updates to the state vector would be applied by hand. I freely admit to not having worked through the code, but I believe the state vector update computations occur here: http://www.ibiblio.org/apollo/listings/Comanche055/MEASUREMENT_INCORPORATION.agc.html http://www.ibiblio.org/apollo/listings/Comanche055/MEASUREME... sources: http://www.ieeecss.org/CSM/library/2010/june10/11-HistoricalPerspectives.pdf http://www.ieeecss.org/CSM/library/2010/june10/11-Historical... http://en.wikipedia.org/wiki/Apollo_Guidance_Computer http://en.wikipedia.org/wiki/Apollo_Guidance_Computer http://en.wikipedia.org/wiki/Apollo_PGNCS http://en.wikipedia.org/wiki/Apollo_PGNCS http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20090016290.pdf http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/2009001...