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  1. #1
    Join Date
    Mar 2008
    Location
    Argyll
    Posts
    6,241

    Default What might this be?

    The hatch garage on our Moody S31 extends forward in front of the sprayhood to form a dorade with a cowl on each side. Centred between them (over the air inlet below) is a flat white plastic dome, 75mm dia, 20mm. high, about the size and shape of a fried egg. It is secured by three tiny studs with nuts that are almost impossible to reach, a single fine (2.5mm. approx dia,) insulated cable emerges from the bottom centre and disappears into the void between the grp head lining and the coachroof. It is not a standard fitmment other S31s do not have it. It is leaking rain water into this space and proving difficult to seal. I suspect it may be redundant, related perhaps to the old garmin gps or perhaps the navtex. I expect that if I remove it to seal against rain water ingress the cable may break so I am hoping someone may be able to suggest what its function might be before I start trying to release it.

  2. #2
    Join Date
    Nov 2013
    Location
    Perth WA
    Posts
    1,959

    Default Re: What might this be?

    Any chance of a photo!!! (I'm in a bit of a Quandary)
    Last edited by coopec; 12-06-19 at 09:18.

  3. #3
    Join Date
    Aug 2003
    Location
    Swale/Medway
    Posts
    4,308

    Default Re: What might this be?

    Sounds a bit weird. I had an S31 (great boat, by the way) and it had no such feature.
    It's not a GPS aerial, is it?
    Keep up to date with 'East Coast Pilot' at www.eastcoastpilot.com

  4. #4
    Join Date
    Jun 2011
    Location
    Suffolk
    Posts
    5,163

    Default Re: What might this be?

    Sounds like the top Navtex aerial to me or one of the older GPS aerials.
    Pardon?

  5. #5
    Join Date
    Nov 2009
    Location
    Southampton
    Posts
    35,364

    Default Re: What might this be?

    It sounds like a perfectly ordinary GPS antenna, possibly incorporating the receiver and possibly not, depending on whether the cable is co-ax or multi-core.

    Pete

  6. #6
    Join Date
    Jul 2008
    Location
    East coast UK. Mostly. Sometimes the Philippines
    Posts
    8,788

    Default Re: What might this be?

    Quote Originally Posted by prv View Post
    It sounds like a perfectly ordinary GPS antenna, possibly incorporating the receiver and possibly not, depending on whether the cable is co-ax or multi-core.

    Pete
    I think so too.

  7. #7
    Join Date
    Mar 2008
    Location
    Argyll
    Posts
    6,241

    Default Re: What might this be?

    Was up this morning and failed to remove it but managed to get it up enough to get some CT1 under it which means it is now stuck down for good. The cable is tied in a bundle in the void under it before heading in the direction of the chart table. I had suspected GPS but the cable is very thin and flexible and is not co-axial, looks just like thin single core. There is a Navtex and an old Garmin Gps, both seem to be working though they are rarely used in these times when you get everything on the phone. Hopefully it is dealt with now, it has to stay regardless of function to cover the hole under it.
    Thanks for the guesses, my curiosity remains.

  8. #8
    Join Date
    Feb 2005
    Location
    Tarbert Harbour, East Loch Tarbert, Loch Fyne, Scotland, UK
    Posts
    664

    Default Re: What might this be?

    Quote Originally Posted by Quandary View Post
    Thanks for the guesses, my curiosity remains.
    Can you cover it with something which is likely to blank out a signal? Eg, metal bucket / sheet of lead ? and see what stops working.

    Ash

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