server 0.pool.ntp.org maxpoll 5
server 1.pool.ntp.org maxpoll 5
server 2.pool.ntp.org maxpoll 5
server 3.pool.ntp.org maxpoll 5

driftfile /var/lib/chrony/drift

allow

makestep 1 5

refclock SHM 2 pps refid NMEA
#refclock PPS /dev/pps0 precision 1e-7 noselect refid GPPS

rtcsync