Glossary
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F
FEC Forward Error Correction. A system of error control for data
transmission, whereby the sender adds redundant data to its
messages, also known as an error-correcting code. This allows
the receiver to detect and correct errors without the need to
ask the sender for additional data. The advantage of forward
error correction is that a back-channel is not required.
G
GMDSS Global Maritime Distress Safety System. The system is intended
to perform the following functions: alerting (including position
determination of the unit in distress), search and rescue
coordination, locating (homing), maritime safety information
broadcasts, general communication, and bridge-to-bridge
communication.
GPL General Public License, Software license, which guarantees
individuals, organizations and companies the freedom to use,
study, share (copy), and modify the software.
GPS Global Positioning System. A system of satellites, computers,
and receivers that is able to determine the latitude and
longitude of a receiver on Earth by calculating the time
difference for signals from different satellites to reach the
receiver.
H
HF High Frequency. The frequency band between 3 and 30 MHz.
Used for medium and long range terrestrial radio
communication.
I
ITU International Telecommunication Union
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