#Install Updates
sudo apt-get update
sudo apt-get upgrade
#see USB devices
lsusb
#Install GPS software
sudo apt -y install gpsd gpsd-clients python-gps
#Edit GPS config file
sudo nano /etc/default/gpsd
#Add this to file
START_DAEMON=”true”
USBAUTO=”true”
DEVICES=”/dev/ttyACM0″
GPSD_OPTIONS=”-n”
#Install chrony
sudo apt-get install chrony
#reboot pi
#check to see if services are running
systemctl is-active gpsd
systemctl is-active chronyd
#Check GPS output
cgps – s
gpsmon -n
#Edit chrony config file
sudo nano /etc/chrony/chrony.conf
#Add this to end of file
refclock SHM 0 offset 0.5 delay 0.2 refid NMEA
#Check Chrony Output
sudo chronyc sources -v
# Check chrony output
sudo chronyc tracking
#Force time sync
sudo chronyc makestep
John Hadikusumo 