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    Re: Sextants in Coastal Piloting
    From: Richard B. Emerson
    Date: 2000 Aug 28, 5:54 AM

    ???!  Although I haven't cruised the lower Bay this summer (we went
    north to New England, instead), I have never experienced 20 mile
    errors with or without differential receivers while cruising from the
    Annapolis area as far south as Waterside in Norfolk.  For that matter,
    I have never experienced 20 mile errors anywhere from Seattle to Grand
    Cayman to Frankfurt, Germany, using a simple Magellan 300 handheld
    receiver.
    
    LORAN has been consistently less geodetically accurate.  TD's
    converted to L/L's and even TD's observed compared to their charted
    intersection have been typically 1/4 to 1/2 mile away from the
    receiver's true location although, until S/A was disabled,
    repeatability (returning to a previous TD or L/L fix) was as good or
    better than GPS.
    
    Rick
    S/V One With The Wind, Baba 35
    
    Young, Derrick writes:
     > Russell,
     >
     > I am not sure what is happening with the GPS in some areas.  There are (that
     > might be were - at least when S/A was turned on) areas where GPS would
     > indicate as much as 20 miles off.  One of these areas was the lower
     > Chesapeake Bay and another in St. Louis.  If you were piloting using GPS,
     > you were in trouble.  So, break out the LORAN (that still works) or the
     > sextant.  Take your horizontal angles and you know where you are.
     >
     > The reason that I am not sure is the current status, is that I have not been
     > out on the C'Bay since S/A was turned off - I will be going out in the next
     > couple ow weeks - will let you know what I find.
    [...]
    

       
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