Knowledge Base
magnetic bearing
Bearing relative to magnetic north; compass bearing corrected for deviation.

manufacturer identification code
In the NMEA 0183 standard, a three character manufacturer identifier, usually an acronym derived from the company name, which has been approved and is listed in Appendix III, for use by a manufacturer as part of the address field in formulation of proprietary sentences.

Marlinspike
A tool for opening the strands of a rope while splicing.

MEMS
Micro-Electro-Mechanical Structures. These devices rely on both their electrical and physical properties to operate.

Mercator map projection
A conformal cylindrical map projection in which the surface of a sphere or spheroid, such as earth, is conceived as developed on a cylinder tangent along the equator. Meridians appear as equally spaced vertical lines and parallels as horizontal lines drawn farther apart as the latitude increases, such that the correct relationship between latitude and longitude scales at any point is maintained.

message
In the NMEA 0183 standard, a message consists of 2 or more sentences with the same sentence formatter. Messages are used when 2 or more sentences are needed to convey related data that exceeds the maximum sentence length. This only applies to those sentence formatters that are defined with the key fields supporting multi-sentence messages.

midship
Approximately in the location equally distant from the bow and stern.

mooring
An arrangement for securing a boat to a mooring buoy or a pier.

MSAS
(MTSAT Satellite-based Augmentation System) Far East Satellite Based Augmentation System (see SBAS).

MTBF
Mean Time Between Failures. This is an indication of the reliability of a product in normal use

 
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