server 127.127.20.0 iburst true prefer
fudge 127.127.20.0 flag1 1 refid GPSD
server 127.127.22.0 iburst true prefer
fudge 127.127.22.0 flag1 1 refid KPPS

# Default settings for the gpsd init script and the hotplug wrapper.

# Start the gpsd daemon automatically at boot time
START_DAEMON="true"

# Use USB hotplugging to add new USB devices automatically to the daemon
USBAUTO="true"

# Devices gpsd should collect to at boot time.
# They need to be read/writeable, either by user gpsd or the group dialout.
DEVICES="/dev/serial0 /dev/pps0"

# Other options you want to pass to gpsd
# -n    don't wait for client to connect; poll GPS immediately
GPSD_OPTIONS="-n"

force_turbo=1
dtoverlay=pps-gpio,gpiopin=4
init_uart_baud=9600
arm_freq=800

dwc_otg.lpm_enable=0 console=tty1 root=/dev/mmcblk0p7 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait splash plymouth.ignore-serial-consoles

# /etc/modules: kernel modules to load at boot time.
#
# This file contains the names of kernel modules that should be loaded
# at boot time, one per line. Lines beginning with "#" are ignored.

i2c-dev
pps-gpio

GNU nano 2.7.4                                                             File: /etc/rc.local

#!/bin/sh -e
#
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.

# Print the IP address
_IP=$(hostname -I) || true
if [ "$_IP" ]; then
  printf "My IP address is %sn" "$_IP"
fi

ln -s /dev/serial0 /dev/gps0
service gpsd stop
service ntp restart

exit 0

pi@raspberrypi:~ $ ntpq -pn
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
 127.127.20.0    .GPSD.           0 l    -   64    0    0.000    0.000   0.000
x127.127.22.0    .KPPS.           0 l  156   64   54    0.000  -30.909   6.705
 0.debian.pool.n .POOL.          16 p    -   64    0    0.000    0.000   0.001
+212.26.18.43    209.51.161.238   2 u   24   64  377   63.087   -3.832  11.598
+212.26.18.41    209.51.161.238   2 u   55   64  377   62.326   -2.398  38.556
*212.138.170.134 .PPS.            1 u   56   64  377   93.082    0.377  39.534