Maritime Communication and Safety

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Compare Sea Area A1 and Sea Area A2.

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A1 uses VHF DSC within 30–40 nautical miles from shore; A2 uses MF DSC beyond A1, up to about 180 nautical miles.

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Compare Sea Area A3 and Sea Area A4.

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A3 is within Inmarsat satellite coverage between 70°N and 70°S, while A4 covers polar regions outside satellite range using HF DSC.

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Compare VHF and MF radios.

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VHF is for short-range coastal communication; MF is for medium-range, often used between ships and coast stations.

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Compare NAVTEX and Inmarsat C.

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NAVTEX is an automatic coastal text broadcast; Inmarsat C is a global satellite two-way data system.

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Compare EPIRB and SART.

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EPIRB sends distress alerts via satellite; SART helps rescuers pinpoint survivors on radar screens.

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Compare Distress, Urgency, and Safety messages.

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Distress means grave danger to life, Urgency means help is needed but not life-threatening, and Safety warns about navigational hazards.

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Compare Expanding Square and Parallel Track search patterns.

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Expanding Square is used for small areas when the position is known; Parallel Track is used for large areas when position is uncertain.

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Compare Sea Area A1 and A3 based on coverage.

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A1 is for coastal VHF range; A3 covers ocean areas under satellite communication.

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Broadcast a sample MAYDAY message for a ship on fire.

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“MAYDAY, MAYDAY, MAYDAY. This is M/V LIMA STAR, position 13°46’N 120°48’E. Fire in engine room, 22 persons onboard. Require immediate assistance. OVER.”

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Broadcast a sample PAN-PAN message for an injured crew member.

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“PAN-PAN, PAN-PAN, PAN-PAN. This is M/V LPU VOYAGER. Crew injured, requesting medical evacuation, position 13°50’N 120°55’E. OVER.”