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DISTRESS PROCEDURES

While the exception of the EPIRB, all distress modes are two-way (i.e. the alert is sent and the alert is acknowledged). The EPIRB is a one-way system; the alert is sent but not acknowledged. Other than EPIRB, alert and acknowledge procedures use essentially the same format.

Voice distress procedures

In voice radio certain procedural words are used as an alarm signal. MAYDAY indicates a distress; MAYDAY RELAY indicates a distress relay and MAYDAY received indicates a distress acknowledgement. Normally the frequency used to initiate the distress alert is the frequency used to acknowledge the alert and becomes the control frequency. Coast stations or rescue units may request a change in frequency to facilitate better communications but the distress unit must agree. A coast station hearing 2182 alarm signal or MAYDAY should impose SILENCE on the distress frequency so that the distress message can be heard. Vessels hearing SILENCE MAYDAY should maintain silence on the frequency until the distress is ended or SILENCE FINI is received.

Procedures for acknowledging a distress using NBDP telex are the same as voice radio except substitute DE for THIS IS and RRR for RECEIVED.

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