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  1. #41
    Join Date
    Jul 2012
    Location
    Lisbon
    Posts
    84

    Default Re: Call yourself a navigator?'

    Keep a sextant onboard , but cheat a bit by using the astro plugin on CPN makes it really easy as the almanac is included

  2. #42
    Join Date
    Feb 2006
    Location
    N Kent Coast
    Posts
    4,167

    Default Re: Call yourself a navigator?'

    Quote Originally Posted by prv View Post
    I don't think losing all GPS receivers is a serious concern nowadays (luddites with a single GPS128 and a clockwork telephone excepted), but failure (deliberate or accidental) of the incoming signals is a plausible risk.
    Electrical storm?

  3. #43
    Join Date
    Nov 2009
    Location
    Southampton
    Posts
    35,609

    Default Re: Call yourself a navigator?'

    Quote Originally Posted by Pye_End View Post
    Electrical storm?
    Have you ever had your mobile phone die because of one? Do you know anyone who has? I don't. I've carried a phone near-constantly since 2001 and I must have been in and around my share of storms in that time. Note I'm not asking about VHF radios and other installed yacht electronics, but referring to the fact that nowadays practically everything with a screen also has a GPS chip in it.

    Nevertheless, on Ariam I have an old handheld GPS and portable depth sounder (and a 24-pack of AA batteries for them) in a metal tin in a deep locker. Not specifically against electrical storms but the closed tin would presumably help. One assumes a well-found boat crossing an ocean could afford the £50 for a similar backup.

    Pete

  4. #44
    Join Date
    Jul 2008
    Location
    East coast UK. Mostly. Sometimes the Philippines
    Posts
    9,798

    Default Re: Call yourself a navigator?'

    Yes but why are the RN using Plath sextants?

  5. #45
    Join Date
    Oct 2012
    Location
    Southminster, essex
    Posts
    9,441

    Default Re: Call yourself a navigator?'

    Did anyone notice Boris J state in one of his early speeches just before or after election to PM that he would provide science funds for UK to have their own GPS system?
    sorry do not want taint thread with politics but it did make me smile
    It is all down to the fact that my wife does not understand me !!

  6. #46
    Join Date
    May 2007
    Posts
    38,254

    Default Re: Call yourself a navigator?'

    Quote Originally Posted by Minn View Post
    Yes but why are the RN using Plath sextants?
    Found a couple in stores and thought they'd make a video?

  7. #47
    Join Date
    May 2007
    Posts
    38,254

    Default Re: Call yourself a navigator?'

    Quote Originally Posted by Daydream believer View Post
    Did anyone notice Boris J state in one of his early speeches just before or after election to PM that he would provide science funds for UK to have their own GPS system?
    sorry do not want taint thread with politics but it did make me smile
    Probably doesn't realise that the UK was very much involved in the current one.

  8. #48
    Join Date
    May 2001
    Location
    North Wales, sailing Aegean Sea or Menai Strait
    Posts
    21,977

    Default Re: Call yourself a navigator?'

    Quote Originally Posted by GHA View Post
    Same question though, has anyone lost all the GPS's onboard either due to jamming the signal or otherwise?

    Would be interesting to see how big a problem it actually is - guessing next to none for the vast majority of us...
    See post #10. The guy I contacted was collecting information, in some sort of official capacity, about total loss of signal in locations worldwide. His e-mails advised me that there are quite a few such places. When we lost GPS in Bay of Naples we had three alternative receivers but all were useless. I plotted our last position on paper but within a few miles we had signal again.
    Answers to some technical queries at new website http://coxeng.co.uk

  9. #49
    Join Date
    Mar 2007
    Location
    Atlantic
    Posts
    21,340

    Default Re: Call yourself a navigator?'

    Quote Originally Posted by prv View Post
    Have you ever had your mobile phone die because of one? Do you know anyone who has? I don't. I've carried a phone near-constantly since 2001 and I must have been in and around my share of storms in that time. Note I'm not asking about VHF radios and other installed yacht electronics, but referring to the fact that nowadays practically everything with a screen also has a GPS chip in it.

    Nevertheless, on Ariam I have an old handheld GPS and portable depth sounder (and a 24-pack of AA batteries for them) in a metal tin in a deep locker. Not specifically against electrical storms but the closed tin would presumably help. One assumes a well-found boat crossing an ocean could afford the £50 for a similar backup.

    Pete
    How often do you replace the old batteries with a new pack? Top tip.

  10. #50
    Join Date
    Jul 2008
    Posts
    1,775

    Default Re: Call yourself a navigator?'

    I've coped very nicely with the Davis Mk25 plastic sextant with an old Ebco as a backup. Thank goodness I never had to use the backup.

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