The horizon depends on the height of your eye - the dipping distance
tables in the almanac give the distance off for height. You will see
objects above sea level 'over the horizon' according to their height so
as the ship approaches, you will see more of it.

It is all in the yachtmaster shorebased course - possibly day skipper too!

Nick

Dan wrote:
Evan Gatehouse wrote:


Ships can come over the horizon in about 10 minutes to your position
if moving at say 22 knots.


AFAIK the horizon is 22 odd miles away. A ship moving at 22kts would
therefore take about an hour to get to you.