Abstract: System for pre-recording a series of travel instructions, each comprising a verbal direction segment and a sound signal representative of a mileage location along the travel route, onto a magnetic recording medium and for synchronizing the intermittent play-back of said recording medium with an automobile odometer and a play-back device to intermittently activate the play-back device for brief time periods at predetermined mileage distances signalled by the odometer, corresponding to the mileage location sound signals on the recording medium.