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overlay: $200K (Reagan) 4-5 chips, power supply schedule ~ 2 mos for design, some time for parts.
Problem: controls for moving picture on screen

7/25
mtg: Monday @ 1300 (CCTV overlay)
overlay positioning: possible sources of error
(1) parallax
(2) misplaced overlay
(3) deformation of CCTV relative to EE (thermal def)
(4) "uncalibration" by operator (monitor adjustment) in flight

(1)&(2) are only problems for a physical overlay (not an electronic overlay) & affect primarily y^ & z^
(3) would affect both & primarily in y^ & z^
(4) would affect only electronic overlay with adjustment capability, & could affect x^, y^, or z^

estimate - .2" on flight monitor = 1" at EE when grapple fixture is at middle of x^ envelope.
y^ tolerance is ±4". Estimate allowable equipment errors
(1) parallax: [[diagram]]
δ = d tan Φ