Tindallgrams

Terms & Abbreviations: G

G&N

Guidance and Navigation.

GCD

Guidance Control Division.

Gimbal Lock

The loss of one degree of freedom in a three-dimensional space that occurs when the axes of two of the three gimbals are driven into a parallel configuration, “locking” the system into rotation in a degenerate two-dimensional space. More at Wikipedia.

GSOP

See Guidance System Operations Plan

Guidance System Operations Plan

The GSOP was essentially the specification for how the guidance computer and its software where required to work for a specific mission. Many of GSOP’s are available online including the GSOP for the cancelled AS-207/208 mission