Just received these great links from USNG08, who left me a message on a prior article of mine:
http://kd0jkm.blogspot.com/2013/07/navigation-coordinate-systems-for.html
His comments as follows:
Some updates:
a) USNGFlorida.org
b) USNGCenter.org
c) GMap4 works on any smartphone even w/o connectivity: http://www.mappingsupport.com/p/gmap4.php?usng=15S_TD_5532_2407&tilt=off&z=4&t=t1
