Distress signals or calls for assistance are
made if required in accordance with Australian and international regulations
and conventions.
Radiotelephony
priority calls are the most commonly used method of raising a general alarm;
the progressive levels described as distress (MAYDAY), urgency (PAN PAN) and
safety (SECURITE). Advances in radio technology has greatly enhanced the
capability to alert for assistance and is considered separately in
element
two, “Establish and maintain
radio-communications”.
Distress messages:
The
position, direction and distance may be properly described in Latitude and
Longitude, true bearings and nautical miles by seafarers, but can be more
casually indicated by land based observers. If in doubt, rescuers must
investigate further, but are ultimately obliged to respond.
Priority Calls:
Radiotelephony priority calls are the most commonly used method of
raising a general alarm; the progressive levels described by as distress
(MAYDAY), urgency
(PAN PAN)
and safety (SECURITE).
Marine
Radio Alarm Signal- With the full implementation of the GMDSS the
automatic 2182 kHz alarm devices are no longer required. However, some
maritime communications stations may still use the distinct warbling sound
voice alarm signal
to draw
attention to a distress broadcast. Merchant shipping complying with the
SOLAS now
guard the Digital Selective Calling (DSC) distress frequencies.
RTF
Distress Signal- The distress signal is used to indicate that a craft or person is
threatened
by grave and imminent danger and requires immediate assistance. It has
precedence
over
all other communications. The distress message is preceded by the
word
MAYDAY spoken three times.
RTF
Urgency Signal- The urgency signal is used to indicate that the calling station
has a
very urgent message to transmit covering the safety of a ship, aircraft or
person.
It has precedence over all other communications, except distress
traffic. The
urgency message
is preceded by the words ’PAN PAN’ spoken three times.
Safety
Signal- The safety signal indicates that the station is about to transmit
a
message
concerning the safety of navigation or providing an important
meteorological warning.
The safety message is preceded by the word ’SECURlTE’
spoken
three
times. All stations hearing either the urgency or safety signals shall
not
make any transmissions that might interfere with those signals.
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