Broda, H. W., et. al., Using GIS and GPS Technology as an Instructional Tool. The Social Studies (Washington, D.C.) v. 94 no. 4 (July/August 2003) p. 158-60.
Both articles have been extremely influential in my research of using GPS with students. Any teacher wishing to pursue this the same and need a rationale and/or purpose for doing so should read these articles by Shaunessy and Broda. The case for using GPS and GIS (geographic information system) and the benefit of using them with students is plainly stated. Not only are these systems described in detail, but ideas and activities are presented as to their application in education. Enjoy!