By 2151, slide rules were considered ancient. In response to Malcolm Reed's request for a sextant, Trip Tucker responded in an equally disparaging manner by saying he left it with his slide rule. (ENT: "Shuttlepod One") However, such a device was sometimes used on the bridge aboard the USS Enterprise during the 2260s. (TOS: "The Corbomite Maneuver" , "Mudd's Women" , "The Naked Time" , "Who Mourns for Adonais?" ) The device used here was specifically a flight computer, typically used in avionics.