What is Global Maritime Distress and Safety System or GMDSS and its details?

 AREA A₄ :-

An area outside , Sea area A1, A2 and A3. This is essentially the polar region.

Carriage requirements for Sea Areas :

Sea Area A₁:-

VHF DSC,  VHF RT, EPIRB, SART, Portable VHF Transceiver, Navtex receiver 518 kH₃, EGC receiver (If Navtex not available)

Sea Area A₂:-

VHF DSC, VHF RT, MF DSC, MF RT, EPIRB, SART, Portable VHF, transceiver, Navtex receiver 518 khz, EGC receiver (where Navtex not available)

Sea Area A₃:-

VHF DSC, VHF RT, MF/HF DSC, MF/HF RT, (*) EPIRB, SART, Portable VHF transceiver, Navtex received 518 khz, EGC receiver means (* Telex).

Sea Area A₄:-

VHF DSC/ VHF RT, MF/HF DSC, MF/HF RT, Telex, EPIRB, SART, Portable VHF Transceiver and Navtex receiver 518 kHz.