Check Area; Ring - Furuno FMD-3200 Operator's Manual

12. NAV TOOLS
12.3

Check Area

Check area sets the area ahead and around own ship for which to check for safe nav-
igation. See section 8.2 for how to activate own ship check.
12.4

Ring

The range rings are the concentric set of rings on the ECDIS 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 is inversely proportional to the chart scale; the larger the
chart scale, the smaller the interval between rings. 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.
12-4
Range
ring