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I hadn't thought about the source data, but what you say about interpolation makes a lot of sense.  The contours can't be any more accurate than the source data.  Thanks!

Thanks.  I do use the Idaho TOPO map also, but since it has only half the vertical resolution of the Nolrthwest USA map, I prefer the later most of the time.  When navigating cross country and trying to select the best route, the extra resolution sure helps.

I am a great fan of the Northwest USA map created by John M, and have been using it for several months now.  I have noticed that a chunk of Idaho is missing.  There is no topographic data for the area between 43-44 degrees latitude and 113-114 degrees longitude shown either in MapSource or on my gps device.  Do others show the same gap?

I did notice errors when I installed the map with MapSetToolkit.  Is that the source of the problem?  Is there an easy fix, or is the data just not available?

David