cgps -VERSION (return code: 0)
cgps: 3.16 (revision 3.16-4)
cgps --help (return code: 1)
cgps: invalid option -- '-'
Usage: cgps [-h] [-V] [-l {d|m|s}] [server[:port:[device]]]
-h Show this help, then exit
-V Show version, then exit
-s Be silent (don't print raw gpsd data)
-l {d|m|s} Select lat/lon format
d = DD.dddddd
m = DD MM.mmmm'
s = DD MM' SS.sss"
-m Display heading as the estimated magnetic heading
Valid only for USA (Lower 48 + AK) and Western Europe.