1. (n.) A servant who called out the hours.

2. (n.) An instrument indicating the time of day; a timepiece of any kind; a watch, clock, or dial.

Big Ben astronavigation celestial navigation clock clock movement clockworks coastwise navigation consolan dead reckoning fix horologe horologium line of position loran pilotage plane sailing point-to-point navigation radar radio beacon radio navigation sextant shoran sofar sonar tables ticker timekeeper timepiece timer turnip watch watchworks