Glossary
54
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
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
L
LGPL Lesser General Public License
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