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Long Range Certificate. Just as every driver needs a license to drive a car, operators of marine radios also require a license. Radio operators on leisure or commercial vessels not under the regulation of the SOLAS convention that are fitted with long range communications (MF/HF radio) or satellite equipment must be qualified to a minimum standard. This standard is the GMDSS LRC (Long Range Certificate).
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.