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Old 11 August 2011, 03:48   #11
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The diagram from Garmin is correct. FYI the reason for two way communication between the GPS and the VHF is that on some combinations if you receive a DSC call it will come up on the GPS, likewise your own VHF will need to know where it is to send out a distress call. Don't forget to register for a MMSI number for the radio. Sorry to disagree with you Erin.
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Old 11 August 2011, 04:48   #12
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I may be wrong, but I didn't think his GPS could handle data input from the radio to display DSC calls and positions. If it does, then I'd certainly wire both tx and rx connections so that it sends data both ways.
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Old 11 August 2011, 04:50   #13
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My understanding is that on a standard DSC call the lat/Long is not supplied so would really make this a waste of time (NMEA radio output to GPS)

Only on very specialist DSC distress set ups, so it would be someone like Coastguard that would use that functionality?

Gary
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Old 11 August 2011, 05:45   #14
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I have an Icom 505 which will transmit position data to my gps when it receives a position request/poll or a dsc distress to 'all ships'. It is really quite a clever system, though the only time I've ever seen it happen is when I was testing it alongside another boat. There are just too many butons to press when you're bouncing about on the waves to make it a practical day to day feature to use.
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Old 11 August 2011, 08:59   #15
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Quote:
Originally Posted by GaryC View Post
My understanding is that on a standard DSC call the lat/Long is not supplied so would really make this a waste of time (NMEA radio output to GPS)

Only on very specialist DSC distress set ups, so it would be someone like Coastguard that would use that functionality?

Gary
Gary, Please be assured that I do know what I am talking about - if you have a look at your DSC radio you will see that there is a flap under which is a distress button (this is all covered in the DSC radio operators course) and pressing this button will send a digital distress call to the coastguard and any other ships within range - this signal will include your position which it gets from the GPS - this is the case for every correctly fitted radio - in fact some radios actually come up with an alarm if no position data is received.

NOT a waste of time!
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Old 11 August 2011, 09:20   #16
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Gary, Please be assured that I do know what I am talking about - if you have a look at your DSC radio you will see that there is a flap under which is a distress button (this is all covered in the DSC radio operators course) and pressing this button will send a digital distress call to the coastguard and any other ships within range - this signal will include your position which it gets from the GPS - this is the case for every correctly fitted radio - in fact some radios actually come up with an alarm if no position data is received.

NOT a waste of time!
DSC 101, but not what the dude was talking about
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Old 11 August 2011, 09:26   #17
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DSC 101, but not what the dude was talking about
Well I'll disagree with you as well! My point is that the benefit of DSC is that all suitably equipped vessels receive a DSC distress call and can either look up the position on their GPS or just look at the screen to see if they are near enough to help - Or am I missing the point and talking a load of rubbish?

If I'm sinking or on fire or similar I would hope there may be a friendly soul who would lend a hand like we did on Sunday afternoon?
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Old 11 August 2011, 09:41   #18
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Or am I missing the point
It looks that way to me

Maybe quit swinging at me and read the guy's post again...
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Old 11 August 2011, 10:37   #19
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Or am I missing the point and talking a load of rubbish?
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My understanding is that on a standard DSC call the lat/Long is not supplied so would really make this a waste of time (NMEA radio output to GPS)
John, I think what Gary is saying is he doesn't see any point in connecting NMEA out from the radio in to the plotter, because a normal DSC message does not contain and position information.

Gary has presumably never received a distress message and had to try and plot the position manually in a choppy sea to see if it was close enough to offer help - otherwise he would see the value in having it immediately appear on the plotter screen (either that or he is some sort of "Rainman" who mentally plots lat/long).

Whilst the value in responding to another's distress is good at the time, it is for most people likely to be a rarely used feature. However there is a potentially useful feature of DSC radios which is rarely used and I suspect GaryC is missing, called DSC Polling. This allows you to request from a friend their current position, which is returned digitally. With the correct plotter connected this will show up on the screen so you can "go to" them. If you regularly sail in company or meet up with friends this can be a useful feature.
Indeed you can use this with a group MMSI - so if ribnetters programmed the ribnet group mmsi into their radios it would be possible for someone with the right plotter to immediately see where all ribnetters in their radio range were (assuming they say "yes" to the polling request).
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Old 12 August 2011, 03:08   #20
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John, I think what Gary is saying is he doesn't see any point in connecting NMEA out from the radio in to the plotter, because a normal DSC message does not contain and position information.

Gary has presumably never received a distress message and had to try and plot the position manually in a choppy sea to see if it was close enough to offer help - otherwise he would see the value in having it immediately appear on the plotter screen (either that or he is some sort of "Rainman" who mentally plots lat/long).

Whilst the value in responding to another's distress is good at the time, it is for most people likely to be a rarely used feature. However there is a potentially useful feature of DSC radios which is rarely used and I suspect GaryC is missing, called DSC Polling. This allows you to request from a friend their current position, which is returned digitally. With the correct plotter connected this will show up on the screen so you can "go to" them. If you regularly sail in company or meet up with friends this can be a useful feature.
Indeed you can use this with a group MMSI - so if ribnetters programmed the ribnet group mmsi into their radios it would be possible for someone with the right plotter to immediately see where all ribnetters in their radio range were (assuming they say "yes" to the polling request).
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