ECDIS-E User Guide Basic Operation of ECDIS-E
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Range Rings
The Range Ring button enables you to toggle the
display of range rings on or off. When range rings
are switched off the button displays Rings Off.
When range rings are switched on the button displays the current scale in
nautical miles, e.g. Rings 1 NM.
The range rings are centred on own ships CCRP and are equally spaced.
Range rings are drawn out to the edge of the display, irrespective of the
range scale 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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