A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Josh Paterson
Date: 2015 Oct 14, 18:57 -0700
The equation in the 1958 Bowditch for Table 22, (Dip of the Sea Short of the Horizon) is
D = 0.4156d+0.5658*h/d
where D is dip in minutes, d is the distance to the obstruction in nautical miles, and h is the height of the observer above sea level in feet.