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Old 09 July 2015, 03:34   #11
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No settings on the Garmin when it was running v2.5 firmware.

Now that I've upgraded to the latest firmware v4.6, there is a NMEA2000 config screen for the M506. However the only setting that's there is to input your MMSI number. Not sure why this is needed, I'm guessing it's something to do with the AIS/DSC integration.

Didn't make any difference, GPS position via NMEA2000 reads as invalid on the M506 both before and after the firmware upgrade.

You need to input your mmsi number into the Garmin so it doesn't see itself as a dangerous target. I ignores your own mmsi. Have you inputted your mmsi into the VHF?
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Old 10 July 2015, 07:32   #12
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No haven't tried that, not sure if I can change it. Also I figure that if the M506 recognises the format over NMEA 0183 than it should also be ok over NMEA 2000.

I'm planning to get a B&G Triton display unit in the near future - that should tell me which unit is at fault.
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Old 20 September 2015, 12:10   #13
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Invalid GPS data to ICOM M506 from Garmin Chartplotter

Update to this

Since fitting my Icom M506 I've had intermittent issues with the VHF losing position & time info similar to the op. I thought I had sorted it by tightening the nmea 2000 connections. I visited the Icom stand at the boatshow, explained the issue & got a "ah! We might know about that" kind of response. There is an issue with Garmin plotters & the V1.001 firmware in the M506. They are now on V1.004 firmware. Just checked mine & it's V1.002. As I was at the stand, another bloke turned up with exactly the same problem. I'm going to get my firmware upgraded over the winter. Unfortunately it can only be done by Icom either on site by their field tech. Or at a service centre.


.....sh1t happens.......
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Old 21 September 2015, 11:21   #14
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Also I figure that if the M506 recognises the format over NMEA 0183 than it should also be ok over NMEA 2000.
I believe this is incorrect. While the two systems are similar in operation (both serial multiplexed communication), I believe the actual "language" used (the one and zero combinations that make up the actual words) are fairly different.

If you're getting any data transmitted correctly either from the GPS to the NMEA 2000 bus or from the bus to the GPS, that implies that the fault is likely how the GPS data is being formatted (rather than a GPS talking to the NMEA2K bus type problem.) As far as what exactly that might be, I can't really help.

jky
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Old 21 September 2015, 12:02   #15
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Further info. I've been in communication with Icom UK again today & the answer is....wait for it..........NMEA0183 The absolute, genuine, no money back guaranteed way to make it work is to use NMEA0183 for position & time data into the VHF. Still use NMEA2000 for DSC & AIS info out of the VHF, but NMEA for data in. Apparently there is a conflict (bug) in the Icom NMEA2000 implementation, they have already resolved this with Raymarine & Garmin by modifying software in the plotters, they can't guarantee that the new firmware for the VHF will resolve the issue with Lowrance etc. So it looks like the soldering iron is coming out tomorrow. Slightly p1ssed off, as the main driver for buying the M506 was the "plug & play" NMEA2000, yeah right
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Old 21 September 2015, 12:28   #16
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Mine works just fine with NMEA 2000 & Lowrance HDS2 :-P
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Old 21 September 2015, 12:33   #17
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Mine works just fine with NMEA 2000 & Lowrance HDS2 :-P
Well, aren't you the lucky boy It works fine radio to HDS, it's the radio that keeps losing its data. You don't realise it until you look at the VHF & it says "No position or time"
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Old 21 September 2015, 12:35   #18
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Well, aren't you the lucky boy It works fine radio to HDS, it's the radio that keeps losing its data. You don't realise it until you look at the VHF & it says "No position or time"
It works just fine at that too! I'd have noticed the constant beeping. That would drive me mad. I bet you're raging....
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Old 21 September 2015, 12:37   #19
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It works just fine at that too! I'd have noticed the constant beeping. That would drive me mad. I bet you're raging....
Beeping????
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Old 21 September 2015, 13:26   #20
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Beeping????
It beeps and displays your message if I turn the plotters off
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