Currently this program is limited to using UTM data that uses the
"North American Datum of 1927" which uses the "Clarke 1866
Spheroid" to represent the Earth's surface. This needs to be
changed so that alternative datums can be used. For example,
more and more data is appearing using the WGS-84 ellipsoid.
Unfortunately, I didn't forsee this issue when the object structure of
the program was initially created and adding additional projections
now will take some effort, but is not impossible by any means. It's
just that changes will need to be made in many places thoughout
the program to deal with this.