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Thanks, Boyd.  Well I guess that answers my question.  I'll just go ahead and purchase Garmin's MapSource TOPO! US 24k West and be done with it.  Thanks again for your feedback.

Denny G.

I use my Garmin GPS eTrex Vista HCx on a bicycle I ride in Southern California.  I want to be able to build routes within maps on my computer and view the elevation profiles before I attempt the rides/routes.  After creating a route (using "California TOPO," "PC Basemap," "Ibycus USA 2.01, and "SouthWest USA TOPO, all downloaded from the GPSFileDepot) in Garmin MapSource/BaseCamp (latest versions A/O 11-02-2010), I cannot get the maps to show an elevation profile.  The "Show Profile" button is always grayed out in "Route Properties" of MapSource or I get an error message in BaseCamp.  As I research this question myself, I understand the maps must be Digital Elevation Model (DEM) GPS Maps.  Are those maps downloaded from GPSFileDepot, mentioned above, not DEM?  So far, I have only found that the Garmin's MapSource TOPO! US 24k West has the DEM capability.  Is this correct?  Can anyone here help me find the MAP(s) that I can use to develop elevation profiles?  Should I get the aforementioned Garmin Map?  Thank you very much.

Denny G.