NAVigational AREA - Under the WWNWS the world's oceans are divided into 16 geographical sea areas, called NAVAREAs which are identified by Roman numerals and comprises NAVTEX CRS identified by a single letter of the alphabet from A to Z.
NAVigational TELex - It is a system for transmitting MSI in GMDSS Sea Area A1 and A2.
Nautical Mile - A nautical mile or sea mile is a unit of length. It corresponds approximately to one minute of latitude along any meridian. The international standard definition is: 1 NM = 1,852 m exactly.