The operational requirement under normal propagation conditions,
when the radar antenna is mounted at a height of 15 m above sea level,
is that the equipment should in the absence of clutter give a clear
indication of:
-
.1
Coastlines
At 20 nautical miles when the ground rises to 60 m
At 7 nautical miles when the ground rises to 6 m.
-
.2
Surface objects
At 7 nautical miles a ship of 5,000 gross tonnage, whatever
her aspect.
At 3 nautical miles a small vessel of 10 m in length.
At 2 nautical miles an object such as a navigational buoy having
an effective echoing area of approximately 10 m2.