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Omnidirectional vlf receiver antenna3/16/2024 In the GMDSS system both terrestrial and satellite methods of communications are interlocked in order to provide an extremely reliable scheme to alert rescue authorities in the event of a vessel being in distress.įrequencies in the MF, HF and VHF bands are used for terrestrial communications via Coast Radio Stations (CRS). The radiofrequency range is divided into a number of bands. Radio signals are transmitted as electromagnetic radiation and occupy the frequency range 3 kHz ~ 300 GHz. 5.2.1 Safety Precautions to be taken when working with antenna:.3.2 Simplex and Duplex Operations – Important Aspect of GMDSS.2.2 Surface wave or Ground wave propagation.2.1 Space wave or Line of Sight propagation.ANNEX III – Technical Details of Sound Signal Appliances.ANNEX II – Additional Signals for Fishing Vessels Fishing in Close Proximity.Annex 1 – Positioning and technical details of lights and shapes.Part F – Verification of compliance with the provisions of the Convention.Rule 35 – Sound signals in restricted visibility.Rule 34 – Manoeuvring and warning signals.Rule 30 – Anchored vessels and vessels aground.Rule 28 – Vessels constrained by their draught.Rule 25 – Sailing vessels underway and vessels under oars.Rule 23 – Power-driven vessels underway.Rule 19 – Conduct of vessels in restricted visibility.Rule 18 – Responsibilities between vessels.
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