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    Re: my first "real" celnav experience
    From: Alexandre Eremenko
    Date: 2005 Aug 25, 08:20 -0500

    I have few qquestions.
    1. Where does your height come from?
    Did you capitan know it, or you measured somehow?
    (My capitan did not know the height).
    2. How large were the waves, and did you take their
    height somehow into the account?
    On Thu, 25 Aug 2005, fedeastro.rossi@libero.it wrote:
    > Hi everybody,
    > yesterday I've had my first "real" celestial navigation experience aboard a 
    real ship and I want to share my results with you.
    > The ship was a ferry crossing the Tyrrenian sea from Golfo Aranci (east 
    coast of Sardinia) to Civitavecchia (Italian west coast not far from Rome).
    > The master is an old friend of my family and allowed me to stay on the 
    bridge and try navigation "the old way".
    > Not everything went right, the morning dawn horizon wasn't very clear and 
    while trying to refine my first two sights I realized it was too late to 
    sight the two other bodies I had planned to observe.
    > Anyway I think it proved interesting all the same, since as you can see 
    working out the sights by yourselves the GPS position lies almost perfectly 
    on the line bisecting the two LOPS: this line should be free of sistematic 
    errors introduced by the observer (while random errors can be eliminated 
    averaging multiple sights).
    > Here are the data:
    > 24th August 2005
    > Central Tyrrenian Sea (Italy)
    > DR position 41 22 N 10 23 E
    > Heading 53 true
    > Speed 17 kts
    > I.C. + 0.5'
    > eye's height 21.8 meters
    > Capella
    > 03 55 02 UTC
    > sextant altitude 62 56.3
    > Mars
    > 04 00 09 UTC
    > sextant altitude 62 07.5
    > GPS fix at 2nd observation time 41 25 N 10 28.5 E
    > I hope to have a second chance soon, and this time I won't miss a sight!!!! (or so I hope.....)
    > Federico
    > ____________________________________________________________
    > Libero Flat, sempre a 4 Mega a 19,95 euro al mese!
    > Abbonati subito su http://www.libero.it

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