erice 732 Posted May 21, 2015 Share Posted May 21, 2015 if a DSC VHF distress call with lat/long will show up on your plotter will it show up on a coast guard or police launch plotter? ie is this DSC receive blindspot nz coastguard stations only or is it land stations and coastguard boats? Quote Link to post Share on other sites
Island Time 1,246 Posted May 21, 2015 Author Share Posted May 21, 2015 Erice, the shore stations have to have the reception gear. A DSC radio that can receive the signal over the radio, and transmit it via the NMEA stream to the plotters. ALL the shore stations must have this gear before they can publicly state it is supported. NZ rescue services don't currently have it, and monitoring it is a 24/7 expense. It is not the tech thats the issue, it's the $. By the way, many "DSC" radios only receive, and won't transmit the data over NMEA, so are no good for the "on plotter" setup. Read the specs carefully if buying, read your manual if you already have the set you wish to use. Quote Link to post Share on other sites
rigger 47 Posted May 21, 2015 Share Posted May 21, 2015 My under standing was that as NZ has VHF coverage for most of the coast the DSC capability was not required - the decision also meant that NZ vessels did not have to spend big coin back then to replace non DSC capable VHF radios. NZ does have HF DSC. Having worked in waters much busier than NZ the only time I received a valid VHF DSC distress call was in the Gulf of Aden, after I had already responded to a VHF Mayday call made by another yacht in the same fleet. the Mayday calls were for the same reason. Quote Link to post Share on other sites
Island Time 1,246 Posted May 22, 2015 Author Share Posted May 22, 2015 Maybe Rigger, but I don't agree with that logic. DSC is a simple, one button press distress call. Can be made in under a second, and allow you to keep dealing with the issue, rather than being tied to the radio.... IMO it should be used. But it is not. Here, in NZ. Quote Link to post Share on other sites
MarkMT 68 Posted May 22, 2015 Share Posted May 22, 2015 It seems surprising to me that DSC is not supported by NZ coastguard shore stations. I have a Std Horizon HX851 that I carry on my body when sailing my Formula 16, e.g. singlehanded on Lake Michigan, and DSC was a significant selling point for me. If I'm on my own, in the water, on Lake Michigan and I have to make a distress call, I don't know for sure that I'm going to be in a position to carry on a voice conversation. Quote Link to post Share on other sites
rigger 47 Posted May 22, 2015 Share Posted May 22, 2015 Maybe Rigger, but I don't agree with that logic. DSC is a simple, one button press distress call. Can be made in under a second, and allow you to keep dealing with the issue, rather than being tied to the radio.... IMO it should be used. But it is not. Here, in NZ. Agree in part IT. Yes it is simple to send a distress message, but how many people have the DSC VHF connected to a GPS (I know some units may have GPS built in the uniden mystic and Std Horizon HX851 do), and if the radio is not connected to a GPS do the users know how to enter a position? BTW - Looking at this http://baymarineelectronics.co.nz/communications/vhf-radios.html and see the comments on the Icom M304 DSC (Digital Selective Calling) one touch distress and location alert but if you look at the manual... When a GPS receiver (NMEA0183 ver. 2.0 or 3.01) is connected, the transceiver indicates the current position data in seconds of accuracy. and check the specs, there is no built in GPS so you need to follow the instructions in the manual and you have to wait for a response then transmit on 16 the info required - so tied to a radio.... So how many people here have a VHF with DSC connected to a GPS for positioning data, or do not know? IT, would it be worth shifting the VHF DSC stuff to a new thread? Quote Link to post Share on other sites
erice 732 Posted May 22, 2015 Share Posted May 22, 2015 as previously stated mine is connected to GPS when vhf on but gps off a satellite icon with strength waves? flashes on the display when the gps signal is received the sat. icon stops flashing and the strength waves ripple also pressing setup causes the date, lat/long + MMSI to scroll across the bottom of the display and for distress we should ask coast guard if we can have a test day from marinas - moorings and see what who gets what Quote Link to post Share on other sites
180S 20 Posted May 22, 2015 Share Posted May 22, 2015 I went thru this a couple of years ago when I replaced my VHF. DSC is mandatory in the EU and States, and to my knowledge must now be classD http://www.vhf-dsc.info/tech.html The data channel is CH70, which seems to be allocated in the NZ frequency spectrum to DSC. Anyways, I was incredulous that since every VHF radio sold has DSC, that coastguard didn't monitor it; why wouldn't SAR utilise such a fool proof system of emergency location. Must surely be a simple matter of running a data log on CH70. Enquiries with Coast guard advised me it is unsupported and when question as to the why directed me to Maritime NZ. Enquiries to Maritime NZ advised me it was unsupported and directed me back to coastguard ! I have my VHS connected via NMEA2000 connected to the chart plotter and GPS and like IT says, I will also be relying on someone picking up my DSC distress location on there VHF and advising SAR if required. Quote Link to post Share on other sites
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