How to sync time from GPS using NTP On Gentoo

Question

I have a problem in synchronizing system time with GPS time. I am using U-Blox GPS Receiver. The GPS receiver is working fine through /dev/ttyXR4 port.The problem now, I want the system to automatically update itself with GPS time using NTP client.

I have installed gpsd and also net-misc/ntp-client on my Gentoo machine. I ran cgps, and xgps, the GPS receiver is totally working fine.

my ntp.conf looks like this : (I copied this from Ubuntu since I did this once and it works fine with Ubuntu)

 pool us.pool.ntp.org iburst

driftfile /var/lib/ntp/ntp.drift
logfile /var/log/ntp.log

restrict default kod nomodify notrap nopeer noquery
restrict -6 default kod nomodify notrap nopeer noquery
restrict 127.0.0.1 mask 255.255.255.0
restrict -6 ::1

# GPS Serial data reference
server 127.127.28.0
fudge 127.127.28.0 time1 0.9999 refid GPS

# GPS PPS reference
server 127.127.28.1 prefer
fudge 127.127.28.1 refid PPS

# Clients from this (example!) subnet have unlimited access,
# but only if cryptographically authenticated
#restrict 192.168.123.0  mask  255.255.255.0 notrust

restrict 192.168.1.0  mask  255.255.255.0 nomodify

so, anyone can guide me with this problem to feed the time from GPS to NTP and afterwards change my system setting automatically??

Thanks a lot :)