periscopic sextant

periscopic sextant

[‚per·ə′skäp·ik ′sek·stənt]
(navigation)
A sextant designed to be mounted inside an aircraft, with a tube extending vertically upward through the skin of the aircraft.
A sextant designed to be used in conjunction with the periscope of a submarine.
References in periodicals archive ?
I did all of the celestial observations for the navigator using the periscopic sextant.
As part of the navigation team, I did all of the celestial observations for the navigator using the periscopic sextant.