M
MF Medium Frequency. Radio frequencies (RF) in the range of 300
kHz to 3 MHz. Navtex, which is part of the current Global Maritime
Distress Safety System occupies 518 kHz and 490 kHz for important
digital text broadcasts.
N
NMEA National Marine Electronics Association (standard). A combined
electrical and data specification for communication between
marine electronic devices such as echo sounder, sonars,
anemometer (wind speed and direction), gyrocompass, autopilot,
GPS receivers and many other types of instruments. It has been
defined by, and is controlled by, the U.S.-based National Marine
Electronics Association.
S
SD Secure Digital. A non-volatile memory card format developed by
Panasonic, SanDisk, and Toshiba for use in portable devices.
Currently it is widely used in digital cameras, digital camcorders,
handheld computers, netbook computers, PDAs, media players,
mobile phones, GPS receivers, and video games.
SDHC Secure Digital High Capacity. An extension of the SD standard
which increases card’s storage capacity up to 32 GB. SDHC cards
share the same physical and electrical form factor as older (SD 1.x)
cards, allowing SDHC-devices to support both newer SDHC cards
and older SD-cards.
SOLAS (International Convention for the) Safety Of Life At Sea. Generally
regarded as the most important of all international treaties
concerning the safety of merchant ships.
SSD Solid-State Drive. A data storage device that uses solid-state
memory to store persistent data. An SSD emulates a hard disk
drive interface, thus easily replacing it in most applications.