ECDIS User Guide
Basic Operation of ECDIS
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65900012
Range Rings
The Range Ring button enables you to toggle the
display of range rings on or off. When range rings
are switched on the button shows the current scale in nautical miles (NM).
The range rings are centred on own ship’s
CCRP
and are equally spaced.
Range rings are drawn out to the edge of the display, irrespective of the
scale ratio or any offsetting of the CCRP.
The range ring interval is dependent on the currently selected scale ratio. If
the scale ratio is 1:2,000,000 and over the range rings are disabled.
The table below lists when the range ring interval changes at a particular
scale ratio.
Scale Ratio
Range Ring Interval
(NM)
1:500
0.025
1:3,000
0.05
1:5,000
0.10
1:8,000
0.25
1.30,000
0.5
1:80,000
1
1:150,000
2
1:300,000
4
1:500,000
8
1:1,000,000
16
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