JRC JMA-3400 Series, Instruction Manual, Page: 238 / 314

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Chapter 9 TRUE OR FALSE EHOS ON DISPLAY
When the height of own ship's scanner is 10 m for instance,
(a) A target that can be detected at the radar range of 64 NM on the radar display is required to have a
height of 660 m or more.
(b) If the height of a target is 10 m, the radar range has to be approx. 15 N M .
However, the maximum radar range at which a target can be detected on the radar display depends upon
the size of the target and the weather conditions, that is, the radar range may increase or decrease
depending upon those conditions.
9.2 REFLECTION FROM TARGET
The signal intensity reflected from a target depends not only on the height and size of the target but also on
its material and shape. The echo intensity from a higher and larger target is not always higher in general.
In particular, the echo from a coast line is affected by the geographic conditions of the coast. If the coast
has a very gentle slope, the echo from a mountain of the inland appears on the radar display, as shown in
Fig. 9-1-2. Therefore, the distance to the coast line should be measured carefully.
Fig. 9-1-2
Mountain displayed on the radar display
Sea shore line not displayed on the radar
HL