What this page is about
Due to the availability of Iridium satellite technology, the Internet is becoming increasingly useful and used. However, prudence dictates that it should not be relied upon as the sole method of getting MSI, contacting shore based information sources or other vessels. Even with good satellite connection, HF/SSB still has a role to play, especially when used with Digital Selective calling.
At some stage or other, blue water sailors will venture beyond the range of the excellent marine VHF and S&R services around Europe, the UK & North America. Here, Allan Riches of Brunei Bay Radio in gives help and guidance in the use of DSC HF/SSB radio. It is aimed, particularly at those crossing the Pacific but has wider application..
- SOLAS and the GMDSS - how they apply to leisure sailors
- Marine Radio Communications for the leisure sailor
- A warning shot from the US Coastguard
- A threat to Internet services
- The future of the GMDSS in the Internet age
Mutual Support via DSC CapableHF/SSB Radio
Most cruising and racing sailors know the value of the safety net created by closely integrated professional, 24/7,
S&R capabilities and centralised maritime distress communication services around the UK, Europe and coastal
North America. But once we move away from the protection of these services, sail and engine powered yachts
need to rely on each other, and other nearby mariners. Especially in the Pacific and Indian oceans, around most of
Australia's coast and in SE Asia.
1. Modern marine HF/SSB radios with DSC provide the convenient means to link together yacht crews in
races, rallies, cruise-in-company groups or cruising independently, to create a quick response and nearby
mutual support network. There is no need to wait till the next sked to get helpful advice, a dinner recipe,
warnings about floating hazards, or info to plan a landfall. The DSC radio maintains a silent, 24/7 watch
for Individual, Group or Distress calls, with a muted speaker, so crews can enjoy the anchorage, sunset or
ocean passage. The radio only becomes noisy ringing like a phone when a call is received. And all
voice calls for general or distress purposes are free.
2, Hong Kong, New Zealand and Australian MRCC websites highlight the very limited availability of S&R
resources on their side of the world. This means that other shipping including fishing trawlers, liveaboard
surf/dive charter boats, merchant ships and yachts are likely to be the closest and quickest
source of assistance. Marine HF/SSB radio with DSC is the convenient and no-call-cost common
communications link. A single DSC distress alarm can alert any and all similarly equipped vessels nearby.
It is not necessary to know who is there or their number.
3. MRCC Australia's latest website revision highlights yet again that a 24/7 watch on a marine HF/SSB
radio is the most effective communication option for a prompt response in regions without quick
response, dedicated, 24/7 S&R services. While satellites and satellite-compatible distress beacons have
significantly improved the effectiveness of SAR operations, the system is NOT a substitute for carrying
appropriate marine radio
your initial distress alert should still be made by radio if possible
communication should first be attempted with others close by using radios.
The basic concept of the
Global Maritime Distress and Safety System (GMDSS) is that search and rescue authorities ashore, as
well as shipping in the immediate vicinity of a ship in distress, will be rapidly alerted.
International Maritime Organization (IMO) has strongly recommended that non-SOLAS (Safety of Life
at Sea - SOLAS) vessels (under 300 tonnes) to be fitted with GMDSS-compatible equipment.
4. Yachting Australia and Royal Hong Kong Yacht Club now require installation of DSC capable HF/SSB
radios. The combination of radio's unique broadcast feature with the silent speaker and DSC calling
system makes a 24/7 watch for DSC calls practical. This 24/7 watch by other nearby yachts underpins the
mutual support and prompt response capability during events races or rallies or recreational cruising.
5. Enhanced vessel-to-vessel DSC calling is achieved by adopting the amended General receiver scanning
strategy recommended by Terry Sparks. Enhancing vessel-to-vessel DSC calling capability is now the
topic of an official GMDSS amendment; to increase mutual support and nearby assistance.
6. MRCC Australia recommends the use of Group Call MMSI IDs using the same GroupCall ID creation
technique promoted by Terry Sparks to simultaneously and conveniently call all yachts in a race, rally
or cruising group; eg, for advice, to warn about hazards, or to start a voice sked,. See Search and rescue in Australia
Mutual support and helpful assistance from like-minded and resourceful yachties has proven on many occasions
to be critical to enhancing the cruising lifestyle, resolving problems, preventing distress situations or ensuring a
quick response to a distress situation. The modern marine HF/SSB radio with DSC (quietly) links everyone
together despite distance or geographic obstructions to create this mutual support network. Via radio, all calls
to request/provide advice, spare-parts, support or rescue are FOC.
And the same radio is the basis of low-cost email on-board using the not-for-profit SailMail Association's 20 linked stations around the world. Request no-cost METAREA forecasts, GRIB weather charts or SPOT forecasts. Submit free Yotreps position reports, and organise shore arrangements, spare-part shipments, crew arrival/departures, shore excursions, marinas, entry/exit formalities, cruising permits etc. Maintain contact with family, manage work or investments, and communicate directly with race or rally organisers ashore.
The following will help and inform further:
- Yachting Australia Special Regulations - " For Racing and cecommended for Cruising
- Australian cruising club article - Adrift in Indonesia
Marine HF/SSB Radio with DSC
- A Communications Strategy
- Effective Distress and General Communications
- Easy Installation Strategies
- DSC Functionality