On Sun, 12 Feb 2012 12:32:57 -0500, "Cliff Hartle"
A smartphone app could do most of the functions using a regular laser range
finder. It could even use the phones angle finder for the more advanced
geometric functions requiring an angle.

How accurate are regular laser range finders? IIRC, this one would
accurately record a distance of 200 meters to +/- a millimeter. The
regular laser range finders couldn't do that the last time I looked at
one.