A SERVICE OF

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15. NAV TOOLS
15-4
15.3 Check Area
Check area sets the area ahead and around own ship for which to check for safe nav-
igation. See section 11.2 for how to activate own ship check.
15.4 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 intervals are 0.025 NM, 0.05 NM, 0.1 NM, 0.25 NM, 0.5 NM, 1.0 NM, 2.0 NM,
4.0 NM, 8.0 NM, 16.0 NM, 20.0 NM.
Range
ring