Vhf Emergency Frequency. Additional Information, Frequencies, & Charts Also available are

Additional Information, Frequencies, & Charts Also available are International VHF Maritime Radio Channels and Frequencies, Narrowband VHF Maritime Channels and Frequencies, Radio Information for Boaters, and U. Effective 21 JUL 2016 - 15 SEP 2016. 4390 SIMPLEX 2. Sometimes for brevity, sometimes as another way to read back a frequency assignment to make sure it was received correctly, and occasionally out of laziness. 585 are for low-power use. In the real world In the real world, the pilot uses mainly radio communication in the very high frequency band (VHF) in order to use voice communication. 5 MHz watch on VHF emergency channel 121. On oceanic flight, with the long distance involved between ATC and pilots, the High frequency (HF) communication band is selected by using the long range communication property of this frequency. Usually the authorities try very hard to assign radio frequencies for various ATC units and functions to ensure that transmissions from pilots will not be received by more than one ATC unit, and if there are problems a new frequency will be assigned instead. On top of that, it is a frequency that doesn’t have lots of interference and noise.

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