Mounted vs. handheld: Most of the GPS receivers
used for field mapping, yield mapping, and variable
rate application are fairly large and intended to be
securely mounted on the vehicle during use. Their
size, weight, and power consumption generally make
them undesirable for other uses. Another drawback is
that these GPS receivers cannot be used in a standalone
mode. Many do not even display the location. Instead,
they are intended to deliver ASCII text data to a
computers that, in turn, display the location on maps
and are used to record the location and other needed
information.
Handheld