Moderated Discussion Areas
ContinuousWave: Small Boat Electrical
DSC Position Request
|Author||Topic: DSC Position Request|
posted 11-08-2011 10:49 PM ET (US)
If two boats are equipped with DSC radios connected to GPS one boat can send a DSC position request to the second boat and the radio on the second boat will send back the position of the that boat to the first boat.
To test this I used the following boats:
The Holly Marie, a 23 foot Walkaround with a Garmin 3206 GPS and Standard Horizon Matrix GX2100.
The Emmarie Jean is a 16' 7" Sakonnet with a Garmin 172C GPS and a Standard Horizon Eclipse GX1000S.
Both boats have a MMSI number and both boats have the other boat's MMSI number imputed in their radios.
The Holly Marie is going to request the position of the Emmarie Jean.
1: From the normal display on the GX2100 push the CALL MENU Button to go to the DSC menu.
2: On the DSC Menu, rotate the channel knob to select position request. Push the select soft key.
3: On the position request call list menu, rotate the channel knob to select the name of the boat to call. Push the Select soft key.
4: Push the yes soft key on the display to transmit a position request to the Emmarie Jean
5: The position of the Emmarie Jean is now displayed on the Holly Marie's GPS. Bearing 276M 19.6 ft away.
6: Looking to port from the Holly Marie we see the Emmarie Jean about 20 feet away.
posted 11-09-2011 09:00 AM ET (US)
John--Thank you for the very interesting narrative and pictures of your DSC position poll experiment. I think you have reached the same conclusion that I have:
In order for a boater to test his DSC radio he has to own another DSC radio himself to test with.
This comes about because, as the USCG noted, about 90-percent of the DSC radios installed in recreational boats are not properly interfaced to their GPS receiver. I suspect that an even higher percentage, more than 90-percent, are not interfaced to a chart plotter. So the chances of randomly finding another boat with a DSC radio that can do a position poll test is probably about one in one-hundred.
posted 11-09-2011 09:16 AM ET (US)
I noticed in John's pictures that the only other boat saved in his list of MMSI numbers was "ConWave", which I presume is ContinuousWave.
On my new boat I have the VHF radio and the GPS chartplotter interconnected, and I have received and programmed my MMSI number into the radio. I'm now a part of the 10%, and I will be happy to run a test with you in the spring, Jim.
posted 11-09-2011 10:25 AM ET (US)
Kevin--I look forward to including you in the coterie of vessels whose MMSI is in my radio's call directory, but you first have to tell us the name of your vessel. (And, then, or course, its MMSI.)
posted 11-09-2011 10:45 AM ET (US)
Kevin you are correct, ConWav is ContinousWave. (the only DSC equipped boat I know)
Unfortunately when Jim and I have run together I did not have my GPS connected to my DSC radio. We have used the DSC call feature to call each other but with my installation incomplete we could not use the position options.
A great example of the potential of DSC and GPS is when we left Killarny this summer on that foggy rainy morning.
As we motored off, Jim had a problem at the dock and did not leave as scheduled.
Kevin- I hope I also get a chance to use the DSC technology with you next summer.
posted 11-09-2011 11:43 AM ET (US)
My radio (a Raymarine Ray 55) pretty-much forces you to interface it with a GPS. If you don't do this or input a position manually, it will beep like hell until you do.
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