Jimmy Cornell - World Cruising Routes World Cruising Routes by Jimmy Cornell

      

Other books by Jimmy Cornell
| Home | Mailing Lists | Bookstore | Weather | Tide Predictions | Bowditch |

Re: dip, dip short, distance off with buildings, etc.

From: Bill (no email)
Date: Tue Jan 10 2006 - 19:33:28 EST

  • Next message: Frank Reed: "Re: dip, dip short, distance off with buildings, etc."

    Using a value for lift due to refraction between Franks 0.15' per nautical
    mile, and lift in feet = distance in nautical miles squared * .287, I solved
    for new values for the Bowditch Table 15 formula.

    Try replacing .0002419 with .0002001, and .7349 with .6079.

    I have done three trial runs with the new values, and they seem to approach
    reality with the average of mean refraction values derived from the two
    methods above, a least when height of eye is 0.

    I would be very interested in feedback.

    Thanks

    Bill


  • Next message: Frank Reed: "Re: dip, dip short, distance off with buildings, etc."



    | Home | Mailing Lists | Bookstore | Weather | Tide Predictions | Bowditch | Trawlerworld |