Range rings show a set of concentric circles labeled by distance from a central point, sometimes with radial lines, for judging distance and angle from a geographic location. Keywords: Range rings, radius circles, circles of distance
My DeLorme GPS has these. Garmin doesn't appear to. A quick web search will turn up so many hits that I think the message is clear. Range rings are SO much more useful than scaling lines on a map device. While they are useful on a paper map because you can't draw and erase circles all over your map, there is no excuse for not having them on an electronic device.
Even with paper, during search and rescue (S&R), we will draw them on maps, knowing that the maps will be tossed at the end of the event.
For groundwork, I find the radial lines useful. For cycling and driving, not so much. Toggling either on|off would be useful.
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