"C" Rendezvous W-Matrix

This memorandum is to inform everyone in writing that MIT has now agreed with MPAD that it is acceptable to use the same values of the W-Matrix when reinitializing (after three marks of the last batch of marks between NSR and PTI) as are used initially. That is, it is not necessary for the crew to punch new values into the DSKY - a clumsy procedure everyone wanted to delete if possible. I think Paul Pixley is to be commended for finally getting MIT’s agreement to this crew procedure simplification.

The actual values to be used initially - that is, the pre-launch erasable load values - have not been finally agreed to yet, but that will not affect the crew procedures. Today’s best guess is 1000 feet and 1 fps.

It is recommended that the flight crew and those responsible for documenting crew procedures, etc. adopt this mission techniques immediately. I have already told most of the concerned by the Don Ameche.

Terms & Abbreviations


The "Display and Keyboard" interface through which the astronauts controlled their guidance computers.


Massachussets Institute of Technology. In these memos, MIT is shorthand for the MIT Instrumentation Laboratory, created and led by avionics pioneer Charles Stark Draper. It is now known as the Charles Stark Draper Laboratory and became independent of MIT in 1973.


Mission Planning and Analysis Division (part of MSC).


Co-elliptical, an orbital maneuver originally used in the Gemini program.