Dan,
I think the overlays may be good for their purpose, but I wouldnt trust them. I feel they may be good for the clean areas where the crosshairs may fall right into the area on the screen they are suppose too, but once you mix other metal object with them they will not read correctly.This also hold true for some of the disc patterns that are set up as they are too tight of a pattern. Any item close to a coin as a nail or even a pulltab will throw off the areas where the coin or good object will fall on the screen and if it is to to tight you may not even hear it. From experience I find the tones is what we have to go by, if there is no other object close to the coin or target we can get it to show on the screen where it is suppose to show, but for me a good 50-80% do not, but the tones is what I go by first, then the crosshairs for trying to ID if possible.
I hope you are doing well with your new Explorer, to me it takes more patience than any other detector I have used. The Explorer is also starting to impress me more every time I use it.
Rick