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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.

Jackie

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
> To: NAVIGATION-L@LISTSERV.WEBKAHUNA.COM
> 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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