Section 7 True and False Echoes on Display  7-2 
 
When the height of own ship’s radar antenna is 10 m for instance, 
(1)  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. 
(2)  If the height of a target is 10 m, the radar range has to be approx. 15 NM. 
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.