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Also that CN does not have very good hydrography.  How does the hydro in IL work with that in CN?  There are also numerous issues with using the more detailed USGS NHD hydro data.  I was thinking of creating a 'base' mapset with roads for those who do not have CN, and an overlay mapset with contours and other data.  Oz, others, any thoughts. suggestions?  

One issue with supplemental hydo data in an overlay used with a road basemap is the problem of the draw priority. Adding polys to an overlay can present problems:

EX: Everything in the overlay gets overlaid, so the hydro will cover the roads...

What has worked for some is to uses a custom .typ's for any added poly in an overlay.

I really liked how the Illinois transparent topo worked, but I did notice that with it active that bridges didn't show. Actually the newest versions of City Navigator have been adding allot of hydro data(at least in WI), they don't show the smallest lakes and streams, but a significant improvement over say a couple versions ago.

I would sacrifice the  good hydro data and use whatever City Navigator has for hydro data, just to have a nice topo transparent layer would be great! though I do like how the Illinois transparent map has the water data too.

Would it make sense for the custom mapsets on this site to contain streets, POI, and water data, then just to have a transparent topographic contour map that can be downloaded separately? That way people like me can just download & add the topo to their existing City Navigator maps & everyone else would have the advatage of being able to hide the topo mapset layer and have a nice clean street map for navigating?
With my idea above this would also eliminate the issue where bridges weren't showing up.

I've been using the Wisconsin topo map available here with my Garmin city navigator maps for awhile, but recently tried the Transparent Illinois topo map & loved it.

I would really like to have a transparent topo map of Wisconsin(& U.P. of Michigan) now that I see how it works with city Navigator, as I wouldn't have to show/hide different mapsets just to see my topo maps & street maps on the same card.

Being new I have been searching the forum and reading the tutorials & making these maps seems like a very big project to get into. Makes me really appreciate all the work you guys have done. anyway I got to thinking why aren't all the states available as transparent maps too?

When making these maps they actually contain less data than the full maps(no streets or POIs), so it would seem that in the process of making the full state maps these topo/water data only maps could be made pretty easy.

Am I way off base here? Is there any reason there isn't more transparent maps available?