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    Re: False Horizons
    From: Jackie Ferrari
    Date: 2005 Aug 28, 18:45 +0100

    Thanks Peter.
     I can get hold of Bowditch so I'll have a look. It would be very handy as I
    have lots of opportunity to take sights but the coastline is very indented
    with many islands so its rarely possible to get a horizon.
    Peter Fogg wrote,
    > Yes there is. There are also tables, so once you know the distance to the
    > land 'short of the horizon' you can look up a correction factor to be
    > added
    > to the dip correction. The dip adjusts for the height of the observer
    > above
    > the horizon, the other for the point where the sea meets the land short of
    > the horizon. From a small boat the horizon is only about 3 nautical miles
    > away so if the land is further than this no correction is needed.
    > Where to find this table? There is a bible of navigation known as
    > Bowditch.
    > Its available online, and someone else may know the chapter, so you can
    > download at least that part.
    > ________________________________________
    > From: Navigation Mailing List [mailto:NAVIGATION-L@LISTSERV.WEBKAHUNA.COM]
    > On Behalf Of jferrari
    > Sent: Monday, 29 August 2005 1:16 AM
    > Subject: False Horizons
    > I'm new to the list and a relative beginner at practical navigation so I
    > hope my question isn't too elementary.
    > Recently I took a noon sight but the horizon was cut short by a spit of
    > land. I took it anyway as I was curious to see how far out my LOP would
    > be.
    > It was about 1nm out. I wondered could anyone tell me if there is a
    > formula
    > relating the distance that the false horizon is from the real horizon for
    > any give height of eye, and the error incurred in the LOP.
    > Thanks
    > Jackie Ferrari

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