usage: gpsctl [OPTIONS] [device]

  --binary            Switch device to native binary mode.
  --debug DEBUGLEVEL  Set debug level to DEBUGLEVEL.
  --direct            Force direct access to the device.
  --echo              Echo specified control string with wrapper.
  --help              Show this help, then exit
  --list              List known device types and exit.
  --nmea              Switch device to NMEA mode.
  --rate RATE         Change receiver cycle time to RATE.
  --reset             Force reset to default mode.
  --rmshm             Remove the SHM export segment and exit.
  --ship CONTROL      Ship specified control string.
  --speed SPEED       Set device speed to SPEED.
  --timeout TIMEOUT   Set the timeout on packet recognition.
  --type DEVTYPE      Force the device type.
  --version           Show version, then exit
  -?                  Show this help, then exit
  -b                  Switch device to native binary mode.
  -c RATE             Change receiver cycle time to RATE.
  -D DEBUGLEVEL       Set debug level to DEBUGLEVEL.
  -e                  Echo specified control string with wrapper.
  -f                  Force direct access to the device.
  -h                  Show this help, then exit
  -l                  List known device types and exit.
  -n                  Switch device to NMEA mode.
  -R                  Remove the SHM export segment and exit.
  -r                  Force reset to default mode.
  -s SPEED            Set device speed to SPEED.
  -t DEVTYPE          Force the device type.
  -T TIMEOUT          Set the timeout on packet recognition.
  -V                  Show version, then exit
  -x CONTROL          Ship specified control string.