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Old 06-02-2016, 07:32   #1
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Join Date: Mar 2011
Location: Eastern Mediterranean
Boat: Jeanneau 54DS
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Unusual (to me) AIS alarm

Hi Folks

As I powered up my Raymarine E120 system this morning, I received 2 AIS alarms:

"No sensor position" and
"No Valid SOG information"

Even after acknowledging, the alarms kept popping back up every couple of minutes or so.

What is strange is that the GPS information is correct, along with the other data (wind speed and direction, cog, etc..).

Background info: 1) a lot of heavy rain showers in the last 24 hours, although no rain at the time of powering the system
2) Due to windage and heavy backflow in the marina , my boat rolls, pitches and yaws quite a lot in these conditions, possibly throwing off the internal compass?


Hoping for the combined enlightenment of the CF community

Cheers, Jean
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Old 06-02-2016, 07:52   #2
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Re: Unusual (to me) AIS alarm

If the waves in the marina upset your AIS then it shouldn't be of much use once outside
Did you check the outside GPS antenna for water ingress?
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Old 06-02-2016, 10:51   #3
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Re: Unusual (to me) AIS alarm

@sailormed: you're right, it shouldn't. Occasionally, i do get funny cog readings when the boat is stationary, but it is probably irrelevant.

The GPS is fine, no water ingress, I did check it.

On the Raymarine forum, there's a mention that these kinds of alarms could be related to a faulty VHF connection, but the information was rather incomplete. which is why I thought I'd ask CF if anyone has ever encountered this kind of fault with their Raymarine AIS and/or antenna.

(the VHF antenna works fine otherwise, I was able to both transmit and receive voice)
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Old 06-02-2016, 10:59   #4
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Re: Unusual (to me) AIS alarm

Sorry, can't help you any further. I installed myself the AIS, VHF, radar and MFD and nothing is Raymarine. Most is Simrad and AIS is ACR Nauticast (USCG approved). So, far away from Raymarine equipment.
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Old 07-02-2016, 10:48   #5
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Re: Unusual (to me) AIS alarm

The AIS has its own GPS receiver, separate from the one that drives your chartplotter. This is a requirement (at least in the US). So it is perfectly possible that your chartplotter is displaying correct SOG, COG data but the AIS unit isn't getting the necessary information. Our Raymarine unit has a separate GPS antenna, which we mounted on our bimini frame. I'd check the wiring to the antenna first.

David
s/v Callisto
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Old 08-02-2016, 00:32   #6
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Re: Unusual (to me) AIS alarm

Thanks for that. I checked the wiring to the antenna, it appears OK.

In trying to isolate the problem, if it was indeed from the unit's GPS receiver, is there a way to check if it is faulty? Can we get a reading from the AIS separate GPS on the plotter screen?

Will continue the investigation...
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Old 08-02-2016, 11:30   #7
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Re: Unusual (to me) AIS alarm

What is the model number of the unit? You can load the proais software on your laptop. Connect the unit with the usb cable and test the unit. You will need to disconnect the 12 volts supplYing the unit.
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Old 09-02-2016, 22:48   #8
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Re: Unusual (to me) AIS alarm

Quote:
Originally Posted by george123 View Post
What is the model number of the unit? You can load the proais software on your laptop. Connect the unit with the usb cable and test the unit. You will need to disconnect the 12 volts supplYing the unit.
It is a 500 unit.

Thanks for this, I'll try it
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Old 10-02-2016, 01:29   #9
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Re: Unusual (to me) AIS alarm

do not disconnect the 12v from the unit while testing. just plug in USB cable if you have the software (doesn't come with unit if bought in US) only some functions of the AIS will work with power off, and USB in. and GPS isn't one of them.
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