Raymarine Ray 106 User's Guide Page 192

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182 RayTech RNS V6.2 - User’s Guide
The following table shows typical maximum radar ranges for various radar
antenna and target heights. Remember that although the radar horizon is
greater than the optical horizon, the radar can only detect targets if a large
enough target is above the radar horizon.
B. 3 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 automati-
cally if the range scale is changed. Range rings can also be turned off.
Standard range scales
*The maximum range depends on scanner type.
Antenna height
(m)
Target height (m) Maximum range
(Nm)
3310
3 10 10.9
5 3 8.9
5 10 12.0
Standard ranges that can be selected are shown in the following table:
Maximum range
(nm)
Number of range
rings (nm)
Range ring
interval (nm)
0.125 2 0.0625
0.25 2 0.125
0.5 4 0.125
0.75 3 0.25
1.5 6 0.25
360.5
661
12 6 2
24* 6 4
48* 6 8
72* 6 12
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