Summarize a gps object, i.e. one inheriting from gps-class.
# S4 method for gps
summary(object, ...)an object of class "gps"
further arguments passed to or from other methods.
Other things related to gps data: [[,gps-method,
[[<-,gps-method, as.gps,
gps-class, plot,gps-method,
read.gps