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optical horizon, the radar can only detect targets if a large enough target is above the
radar horizon.
Range control
The radar picture can be viewed at various scales. The shortest range scale gives a
maximum range of 1/8 nm, measured from the default center to the top of the radar
picture. The longest range scale gives a maximum range of between 24 and 72 nm
depending on the scanner.
• Long range scales provide the best overview of the boats relationship to land
masses, weather fronts and large ship targets in or beyond view.
• Short range scales provide greater detail of the radar echoes close to the boat, and
should be used as the coastline, harbors or other boats in the area are approached.
Concentric range rings are included to help in the judging of distances on the radar
picture. Their number and spacing are adjusted automatically if the range scale is
changed. Range rings can also be turned off.
Antenna height (m)
3
3
5
5
RayTech RNS V5.0 - User's Manual
Target height (m)
3
10
3
10
Maximum range (Nm)
10
10.9
8.9
12.0
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