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Radiotelephony Distress/Emergency Frequencies

Radiotelephony Distress/Emergency Frequencies:
The following frequencies have been designated for distress or emergency:
2182 kHz- The international MF voice distress frequency primarily for ship-to-ship
communications. It is used for follow-on communications after an initial DSC distress alert on 2187.5 kHz for GMDSS shipping. 
In Australia 2182 kHz is monitored by a number of Limited Coast Radio Stations operated by Volunteer Marine Groups. The two-tone alarm may still be used on 2182 kHz to draw attention but auto alarms are no longer a Radio Regulation.

4125.    6215, 8291, 12290 and 16420 kHz- These frequencies have been authorised for common use by ships and Coast Stations using the HF frequencies for single sideband radiotelephony on a simplex basis for calling, reply and safety purposes. 
121.5 MHz- The international aeronautical emergency frequency for aircraft and
those aeronautical stations primarily concerned with the safety and regularity of flight
and having equipment in the 118-136 MHz VHF band. Ships fitted with the capability
are authorised to communicate on this frequency with aircraft for safety purposes.

156.8 MHz (Marine VHF Channel 16)-  The international distress, safety and calling
frequency for the Marine VHF bands. State and Territory Limited Coast radio
stations, port authorities, merchant ships, fishing craft and pleasure craft use VHF Ch
16.          Merchant ships maintain a continuous bridge listening watch on VHF channel 16
to the maximum extent practicable when at sea (review by IMO 2005).

156.3 MHz- (Marine VHF Channel 6) is the secondary distress and safety frequency
in the VHF band and is used for coordination at the scene of an incident.
243MHz- 243 MHZ is the international military aeronautical emergency frequency.
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