main pic
Glossary - Part N

index pic

•  Nautical Mile: A unit of distance used primarily at sea. The nautical mile is defined to be the average distance on the Earth's surface represented by one minute of latitude.

•  Nominal Range: The maximum distance a light can be seen in clear weather (meteorological visibility of 10 nautical miles.) Listed for all lighted aids to navigation except range lights, directional lights, and private aids to navigation.