Mark One Eyeball

Colonial Military term for visual reconnissance or flight plans improvised by the pilots themselves when searching for wreckage, survivors or managing other mission objectives. This becomes necessary when the use of technology isn't applicable or available due to unforeseen, unpredictable, or hazardous changes in completing a mission or task.

Actual military slang for eyes or eye sight. Derived from Royal Navy nomenclature for distinguishing sequential variations of a piece of equipment (i.e., "Mark 13 Depth Charge"). Since the human eye has not changed, it's called the Mark I Eyeball. Typically used when someone relies too much to equipment, "Use your Mark One Eyeball!"

Commander Adama ordered such a search for Kara "Starbuck" Thrace (You Can't Go Home Again) when her ship was heavily damaged by an encounter with a Cylon Raider squadron (Act of Contrition).