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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.
Lowest Usable Frequency is defined as the frequency at below which the signal falls below the minimum strength required for satisfactory reception.
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.
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.
Medium frequency - same mean as medium wave (MW). Frequency bands from 300 to 3000 kHz. For distress calls in sea area A2 Mfrequencies should be used.
MF/HF DSC radio
MF/HF RT radio