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Thanks, that worked. There seems to be some guesswork involved with determining the appropriate quads to select. Is there a way to tell which quads contain the contour data?

First post and I wish to thank everyone for the great info in these forums. I recently installed the California topo that I downloaded from http://www.gpsfiledepot.com/maps/view/28/. I'm using MapSource to transfer the maps to my GPS but for some reason the contour lines are not visible on the unit (they display fine in MS). Changing the level of detail on the setup menu has no effect. Thanks.