If you are talking about the color shading for various depths, others are reporting similar issues with Nav and fishing maps. See the other thread going on at the same time.

http://www.bbcboards.net/showthread.php?t=818344

I need to power mine up and see what its doing.

As far as the speed overlay - try this to set the data overlays the eay you want them. This is from my 7610 with a touch screen. Your mfd may be different, so check your manual for specifics.



overlays.JPG