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Old 29 August 2015, 16:46   #1
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Garmin GPS551 Chartplotter advise pleas

last time out in some rougher stuff lost GPS signal, when I got home tried factory reset seemed to sort the problem, out today it was fine for 2-3 hours but as soon as I found some rough water lost GPS signal again ........ Any ideas??
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Old 29 August 2015, 16:56   #2
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Gotta be a loose connection inside surely?
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Old 30 August 2015, 05:36   #3
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I once lost GPS signal which I attributed to water ingress to the "external antenna" connection.
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Old 30 August 2015, 06:09   #4
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Haven't got external antenna Poly, it's weird kept doing factory reset on the boat yesterday without success, just cleaned the card wiped the connectors off with bit of rag tried again at home and all seems fine! wondering if its possible bad power connection is causing it?? (Got no transducers etc so only power through the connector)
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Old 30 August 2015, 06:45   #5
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I don't have an external antanae either but there is a connector with a rubber cover and water got past the cover. Not sure if the 551 is similar?
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Old 30 August 2015, 07:14   #6
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Battery connections all ok make sure post not broken or green
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Old 30 August 2015, 07:16   #7
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That's very useful info Poly it's quite possible the rubber cap wasn't fitted to antenna socket yesterday or last week, to clarify was it just external water or water egress inside the unit that caused the problem for you?
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Old 30 August 2015, 07:24   #8
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Excuse my stupidity Jeff but what do you mean by 'post'? .... Have had a close look at connector is a bit green but it's only a power source could that cause loss of signal? ....think I will replace anyway just to rule it outClick image for larger version

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Old 30 August 2015, 08:05   #9
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Originally Posted by Budgie1 View Post
That's very useful info Poly it's quite possible the rubber cap wasn't fitted to antenna socket yesterday or last week, to clarify was it just external water or water egress inside the unit that caused the problem for you?
Just water on the connector (like a mini coax. Socket) I just dried it off and all seems to have been fine since - I do carry a backup though.

I think the green is a sign you are getting water into that plug. I'd thoroughly clean and check how it seals and you might find problem solved.
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Old 30 August 2015, 10:37   #10
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Had the same issue with mine, I also got water in the connector and it went green like yours and eventually my 551s stopped working. I bought and fitted a new connector cable off eBay and all was fine. :thumbup:. Dodgy stuff that seawater
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