Sailor's name for the north star, Polaris, which for all practical purposes remains fixed above the north pole, bearing north from everywhere in the northern hemisphere, making it a true aid to navigation.
Imaginary lines drawn through the north and south poles on the globe used to measure distance east and west of the prime meridian at Greenwich, England (designated as 0
Long-range navigation system that uses radio signals transmitted at specific times. An onboard receiver computes position by measuring the difference in time of signal reception. This system is being phased out in favor of GPS.
This website uses cookies to manage authentication, navigation, and other functions. By using our website, you agree that we can place these types of cookies on your device.