My granddaughter just noticed something I hadn't seen. On the 3790 with 2013.10 maps, every once in a while something like a fog appears over an area of the map. It's gray and transparent of course. You can still see the map. She first saw it going down Highway 20 in Dubuque and it appeared every now and then on Highway 151 to Madison, Wi. The area is irregular in shape and causes no distortion. What am I missing on this? Anyone else noticed it? What could it represent? I almost think I'm imagining it except Abby saw it first. Curious to see if I should have known about it.
I'll bet it was dropped, and damaged the display.
Garmin sells the nüvi® 3790LMT & nüvi® 3790T models. That being said could the grey appearing and then disappearing be traffic your encountering ?
Or it could be the DEM display on the 3790 which shows areas of mountains, deserts, etc.. This often changes the background color of the map if your passing through a large area that the DEM is showing in other than the default color.
If you could post a more exact location on 151 between Dubuque and Madison, I can check on my 3790 to see if it appears on my unit
3790LMT What's DEM display? Not sure of exact places it showed up. It was on Dodge Street by the East Dubuque bridge for sure and I think somewhere near Dickeyville. I wasn't paying that close attention.
DEM is Digital Elevation Model which is a digital model or 3D representation of a terrain's surface. See http://en.wikipedia.org/wiki/Digital_elevation_model for full explanation. On the 3790 there is a DEM map file which overlays the terrain surfaces on the road map.
Simulating a drive across the Mississippi River from the intersection of Bluff and Dodge to US20&Hwy35, I notice places where the normal grey background color of the Garmin Map Theme is noticeably darker in certain areas. If this is what your describing then I think it is the differences in the DEM shading that your seeing.
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