15. NAVIGATION TOOLS
15-8
15.5 Ring
The range rings are the concentric set of rings on the chart display. They provide an
estimation of the range to an object. You can turn them on or off from the [Ring] page.
The interval between rings changes with the chart scale as shown in the table below.
How to select the range calculation method
The range calculation method for the EBL and VRM can be selected to Rhumbline or
Great Circle. Do as follows to select a calculation method.
1. Open the menu, then select [NAV Tools] and [Geometry] to show the [Geometry]
page.
2. Select [Rhumbline] or [Great Circle] with the drop down list box for [Rings].
3. Click the [Save] button to save the setting, then click the close button to finish.
Chart scale Ring interval (nm) Chart scale Ring interval (nm)
1:1,000 0.025 1:100,000 2.0
1:2,000 0.05 1:200,000 4.0
1:5,000 0.10 1:500,000 8.0
1:10,000 0.25 1:1,000,000 16.0
1:20,000 0.5 1:2,000,000 20.0
1:50,000 1.0
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