Later, as the months wear on, a series of additional messages arrive from Gerry -- always delivered in the most remarkable and surprising of ways. With each new message comes a new adventure, and each letter signs off in the same familiar way: P.S. I love you..
For a person standing at sea level, however, the horizon is only about 3 miles away. Lets do the calculations. The figure below shows an observer whose eyes are a distance E above sea level. A straight line drawn from the observers eyes tangent to the seas surface touches it at the distance d1, which is the distance to the horizon. If R is the radius of the earth, then, to first order in E/R, it is easy to show that.
Its highest point is some sails that are 16 meters above the surface of the sea. Ut'kikk's horizon distance (based on a 12 meters height) is 13 km. The target's horizon distance (based on a 16 meters height) is 14.5km (extrapolating a bit since the table doesn't actually list 16m). 13 km plus 14.5 km is 27.5 km.