I have begun construction of the basemap in earnest. All my datasets had to be converted to WGS84, since it turns out that my consumer grade GPS only outputs waypoints in that coordinate system. I will display in other coordinate systems, but not output them.
The gdal utilities to the rescue. gdalwarp will convert any raster dataset to a different coordinate system, so I was able to get all my datasets and aerial photos into WGS84 with no problem.
I them used gdal again to generate three meter contours from the dems. Exporting to dxf presented a problem again, since my free trial period for arcv2cad had expired. Fortunately I found a free utility that would convert from shape files to dxf. DXF Author from Massachusetts GIS, does the job well and is free.
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