Digital Selective Calling

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aaronp

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Aug 21, 2005
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Does anyone do any decoding of the new digital data formats on Marine frequencies (for sending your coordinates in an emergency)?
Are there programs available to decode this stuff from a scanner?
Is it just straight ASCII??

Any info would be appreciated.
 

OceanaRadio

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Dec 19, 2002
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Virginia Beach, VA
aaronp said:
Does anyone do any decoding of the new digital data formats on Marine frequencies (for sending your coordinates in an emergency)?
Are there programs available to decode this stuff from a scanner?
Is it just straight ASCII??

Any info would be appreciated.
USCG Navcen website for HF-DSC:
http://www.navcen.uscg.gov/marcomms/cgcomms/call.htm

USCG Navcen website for VHF-DSC, and GMDSS in general:
http://www.navcen.uscg.gov/marcomms/gmdss/dsc.htm

COAA sells a software/soundcard-run DSC decoder that uses the discriminator-tap output of a receiver to decode either VHF or HF Digital Selective Calling. Modification to the receiver is required, and instructions/links to perform this are on the COAA website:
http://www.coaa.co.uk/dscdecoder.htm

Of course if you have a marine radio made after 1998 it has DSC-capability. A marine radio will only receive calls made to ALL SHIP (Safety/Distress) or the unique registered Maritime Mobile Service Identifier (MMSI) of a particular radio in the case of ordinary DSC traffic. The software-run DSC Decoder however will read any DSC traffic that it's connected receiver captures.

Hope this helps.

Jack
 
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