Leica manufactures, amongst other

things, GPS hardware and software.

This hardware and software is used by

many professionals in many applica-

tions. One thing that almost all of our

users have in common is that they are

not GPS scientists or experts in Geod-

esy. They are using GPS as a tool to

complete a task. Therefore, it is useful to

have background information about what

GPS is and how it works.