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NOC Network Operations Centre. This centre is monitoring the entire network in relation to the communication.


Optimum Traffic Frequency is usually the most effective frequency for ionospheric reflection of radio waves between two specified points on Earth. Commonly is taken as 85 % of MUF.


POR is the Pacific Ocean Region. This region is one of the four Inmarsat satellite coverage areas


Point of Service Activation. The PSA is an entity that has concluded a contract with Inmarsat for the activation and maintenance of records and accounts of Inmarsat terminals. A PSA in some cases can be a one-stop shop for service activation, terminal equipment provision and customer support.


Press To Transmit - PTT or “PRESSEL” switch is usually mounted on one side of the microphone or in the middle of the handgrip of a telephone style handset connected to the marine radio communication equipment. To operate correctly, you have to press it in order to switch the radio from receive mode to transmit mode and release it in order to revert to receive mode.


Radio Telephony.
Voice communications.


Rescue and Coordination Centre - This is a centre used for coordination of all SAR activities within specified areas. When a RCC only is operating in the maritime Search and Rescue it's called a MRCC.


A receiver is a device, such as a part of a radio, television set, or telephone, that receives incoming radio signals and converts them to perceptible forms, such as sound or light.


Radio Telephony - Radio communication known as RT uses a Tx (radio transmitter) to send out radio waves of a certain frequency and a Rx (radio receiver) to receive the radio waves at the same frequency. Radio waves consist of electro-magnetic energy in specific frequency bands within the radio frequency spectrum. Frequency of waves means the number of occurrences of a wave per second. For example, marine VHF RT works in the VHF part of the marine radio frequency spectrum, which extends between 156 MHz to 174 MHz.


radio receiver

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