Knowledge Base
nautical mile
One minute of latitude; approximately 6076 feet - about 1/8 longer than the statute mile of 5280 feet.

navigation
The art and science of conducting a boat safely from one point to another.

navigation leg
The portion of as voyage upon which the vessel currently travels. Each leg consists of two waypoints, an Origin, a Destination, and a line between them upon which the vessel travels.

navigation rules
The regulations governing the movement of vessels in relation to each other, generally called steering and sailing rules.

NMEA
National Marine Electronics Association.

NMEA 0183
A One-Way Communication Protocol standard developed in the 1970’s by the National Marine Electronics Association (NMEA) for interfacing marine electronic devices.

NMEA 2000
A Two-Way Communication Protocol standard established in the late 1990’s and early 2000’s by the National Marine Electronics Association (NMEA) for interfacing marine electronic devices.

noise
Additional signals, coming from electronic equipment, that interfere with signals you are trying to measure.

noise density
A measure of noise as a function of frequency (e.g. mG/ Hz1/2) Generally, the larger the bandwidth of your measurement, the more noise you include in your measurement.

null field
In the NMEA 0183 standard, indicates that data is not available for the field. Indicated by two ASCII commas, i.e., ",," (HEX 2C2C), or, for the last data field in a sentence, one comma followed by the checksum delimiter ",*" (HEX 2C2A) [Note: the ASCII Null character (HEX2C2A). [Note: the ASCII Null character (HEX 00) is not to be used for null fields!]

 
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