Always when near or at the coast I look for shipping.
If you are standing at the waters edge you can see a certain distance and maybe see the funnel and bridge of a ship over the horizon.
But if you could quickly get up onto a 150 meters high cliff you would more than likely see the whole of the hull.
This is because you increased elevation has allowed you to increase the distance to the horizon That is your horizon. You are looking over the curvature of the Earth.
That why men were sent up to the Crows Nest to look for other ships.
Today the Navy sends up aircraft to look over the horizon.
Even Radar is limited to line of sight and thatís why the Radar is way up high.
There is one problem which often occurs, distortion due to atmospheric conditions. Like a mirage but at sea. Various forms one is that a ship can look as if itís upside down. Iíve seen that once off the Coast of Northumberland.
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