The ITU-R Working Party
5B-3 dealing with the Maritime mobile service including Global
Maritime Distress and Safety System (GMDSS) adopted a work plan for the
revision of Recommendation ITU-R M.493-13. This recommendation defines
the Digital selective-calling system for use in
the maritime mobile service.
At the last meeting of the working group we
proposed to undertake a major revision of Digital Selective Calling (DSC) for
marine VHF radios and SSB radios.
From the contribution:
To take full advantage of the availability of GPS position data
for radios; to refine the specifications for handheld VHF with DSC; to simplify
the complicated menu trees; to insure more commonality across different
manufacture's equipment and to make the Recommendation more understandable are
widely recognised requests.
This contribution addresses some of the general problems by
proposing possible enhancements of DSC by the followings:
1) include position data in Urgency and Safety
2) initiate Distress alerts by the Distress
button, not by menu tree navigation;
3) define proper new Class H for portable
4) define standard DSC menu structures for VHF
and MF/HF radios;
5) summarise the DSC functions by each class for
VHF and MF/HF radios;
6) allow Position request and Position report
calls for all classes of DSC equipment;
7) remove all redundant telecommands;
8) update and harmonise the terminology to make
it consistent with the Radio Regulations;
9) mandatory user interface specifications and
standard automated procedures.
These proposals are taking into account the experience gained in
recent years with state-of-the-art design practice of the marine equipment industry
and long practice in training of radio operators.
Full text of the contribution
is available here. Please send your comments to Laszlo Mercz at Mercator Publishing.