Glossary


Glossary

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LT

Local Time - A time zone is a region of the Earth that has adopted the same standard time, usually referred to as the local time. Most adjacent time zones are exactly one hour apart, and by convention compute their local time as an offset from UTC.

LUF

Lowest Usable Frequency is defined as the frequency at below which the signal falls below the minimum strength required for satisfactory reception.

LUT

Local User Terminal - LEOLUT and GEOLUT Earth based ground stations, receive and process Distress alerts from 406 MHz EPIRBs relaying Distress information, comprising casualty ID, Position and UTC time, to MCC.

MCC

Mission Control Centres - Their main purpose and function is to relay EPIRB Distress alert information to the appropriate MRCC who coordinates the deployment of SAR units in the SAR region in which the casualty is located.

MES

Mobile Earth Station - The generic name used to describe an Inmarsat-approved terminal which is allowed to access the network, and applicable to both maritime and land mobile communications.

METAREA

The world is divided into 16 (plus 5 polar - not operational yet) METeorogical AREAs. This are regions of the seas, with same outer boundaries as NAVAREA, for which specified nations have the responsibility for the co-ordination of the provision of meteorological information. METAREAs are usually divided into sea areas for weather forecast broadcast using EGC, NAVTEX or voice messages through VHF, MF or HF.


MF

Medium frequency - same mean as medium wave (MW). Frequency bands from 300 to 3000 kHz. For distress calls in sea area A2 MF frequencies should be used.

MF/HF DSC radio

It is a transmitting-receiving system, which allows the operator to either transmit or receive information on the marine MF (Medium Frequency) and HF (High Frequency) band only by DSC (Digital Selective Calling).

MF/HF radio

is a transmitting-receiving system, which allows the operator to either transmit or receive information on the marine MF (Medium Frequency) and HF (High Frequency) band.

MF/HF RT radio

It is a transmitting-receiving system, which allows the operator to either transmit or receive information on the marine MF (Medium Frequency) and HF (High Frequency) band only by voice.


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