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4.2 Returns from a Target
The intensity of returns from a target is related not only to the size of the target but also to the
materials and shape of the components making up the target. Accordingly, larger objects do not
necessarily develop strong returns.
On coastlines, in particular, the intensity of returns is dependent on their physiographic features.
For a coastline with a fairly gradual ascent, only inland mountains areas may be displayed as
echoes. This fact needs to be kept in mind when measuring the distance to a coastline.
● ● ● ● Since the echo which returns from a coastline with a fairly gradual ascent is
weak, observation of such land may not be able to be performed.
4.3 Propagation Path of Radio Waves
● ● ● ● Radio waves may be shielded if there is a large intercepting obstacle (e.g.,
mountains, rain, snow, etc.) in their propagation path and any targets behind the
obstacle cannot be observed.
An island that is not displayed
because of heavy rain in between
the own ship and the island
88
A ship that is not displayed because of an
island in between the own ship and the
target ship
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