
Recently, on January 5th 2010, I wrote in the
UKRivers Guidebook forum that the ITU-R Working Party 5B completed and the Study Group 5 approved an update to the DSC technical standard that concerns handheld VHFs. Those recommendations asked for VHF DSC Class H - now named as a subset of class D- radios to include an integral Global Navigation Satellite Systems (GNSS) capability, to ensure that distress calls to Search and Rescue (SAR) forces and SOLAS vessels include accurate location information. The inclusion of accurate location information with distress calls should be vital to the rapid rescue of persons in distress, and should add to the efficiency of SOLAS GMDSS vessel responses over current voice distress calls on VHF Channel 16, reducing voice communications associated with the distress incidents.
The reason behind this seem to be and IMO supported this, that since handheld DSC radios could be moved from vessel to vessel, consideration should be given to the issuance of MMSIs to indicate that it is a handheld device. This would help also to identify clearly each terminal as granting a sole MMSI number for ship does not help to single out which terminal was used on deck, liferafts, or perhaps in an altogether different ship.
Another reason is that DSC has not a widespread use as mobile telephones and satellite systems have supplanted DSC for commercial use, and its use on handhelds will perhaps be the future of DSC.
On the matter of MMSI numbering for handhelds, a Joint Group of IMO/ITU experts on maritime radiocommunications drafted a revision of Recommendation ITU-R M.585-4 (IMO/ITU
EG 5/3/3) with considerations of a new MMSI numbering sistem for handhelds, which was approved by Study Group 5 at its meeting on 29 May 2009, taking into account the large amount handheld portable VHF’s with DSC and GNSS which may appear in throughout the world in the coming years.
Ofcom has today announced plans to authorise hand held VHF DSC radio sets. These devices use a type of paging system which can be used to call other vessels or make safety, urgency and distress alerts, triggering other DSC radio sets within the antenna’s range automatically to the message that delivers both latitude and longitude of the calling radio set and the nature of the message.
A draft standard -the UK Interface Requirement- enables Ofcom to authorise the use of these hand held VHF DSC. The draft has been submitted to the European Commission for comments of other Member States. However, as the VHF DSC is regarded as an important aid to safety particularly for those in small boats and kayaks, Ofcom has pressed ahead and is now authorising some sets. This authorization will make hand held VHF DSC available to sea kayakers who have until now had to rely on less reliable voice calling on Channel 16.
Ofcom has made authorisation as easy as possible, showing the desire of the Maritime Coastguard Agency (MCA) to see greater use of VHF DSC, as a mean to enhance maritime safety for all users. Hand held VHF DSC is authorised under the Ship Portable Radio Licence, available free of charge from the
Ofcom website.
Sets will not identified under a ship’s Maritime Mobile Service Identity (MMSI) but with their own individual MMSI, which must start with ‘2359xxxxx’. This is because sets may be carried from ship to ship, so they must not be programmed with a ship’s MMSI. Holders of Ship Portable Radio Licences can go onto Ofcoms’s website and simply add VHF DSC hand held to the list of equipment. As with VHF non-DSC hand held radios, the licence covers only one piece of equipment. So, for five VHF DSC sets, a user will need one licence for each set, each with its own MMSI.
Anyone without a licence can register online and apply, ensuring that they include hand held VHF DSC in the list of equipment. The system will automatically generate an MMSI. Licences are free of charge if issued online.
Ofcom has decided not to wait for a harmonised European standard. So, for the time being, hand held DSC may only be used in UK waters. This means that it cannot be used for Automatic Identification Transmission System (ATIS) that identifies individual vessels on the inland waterways of continental Europe, as ATIS identification numbers still relates to a ship, while the MMSI of hand held VHF DSC relates to the individual piece of equipment. So, legally the new British Ship Portable Radio Licence is not valid beyond UK territorial sea, a reason why Ofcom does not still issue an international call sign with that licence as other countries may not authorise hand held VHF DSC or may do it in the future in different terms. These foreign potencies could regard a hand held VHF DSC as illegal under their legislation. However this, a distress call would still be received and acknowledged by foreigns Coast Guards agencies even if afterwards, this could result in enforcement action by the authorities overseas.
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