Guidance comparator indicator indicator built for the Gemini spacecraft, measuring 2˝ x 2.5˝ x 6˝, with the manufacturer's tag on top: "Indicator, Guidance Comparator, Serial No. 104B US, Lear Siegler, Inc. for McDonnell, Per MAC SCD 52-81708-11, Model No. 2700G." The front indicator panel features dual meters, with lights labeled "TANG" and "RADIAL." In fine condition.
Per McDonnell: 'RADIAL, TANGENT lights and Guidance Comparator Indicator (G.C.I.): Monitors tangential and radial GIGS (Gemini Inertial Guidance System) and BIGS (Booster Inertial Guidance System) comparison velocity on the two outside scales. After SSECO these scales display tangential and radial velocity to be gained. One inside scale displays the comparison of BIGS and ARS (Attitude Reference System) velocity along the roll and yaw axis and attitude in pitch plane. The other inside scale displays the comparison of GIGS and ARS velocity along the roll and yaw axis and attitude in pitch plane. Lights, when illuminated, indicate signals are tangential or radial. No light illumination indicates signals are pitch attitude signals.'
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