NTP Time Sync with GPS

Few days ago, a user in Voyage mailing list raised a interesting discussion[1]: How to synchronize the system time if the embedded device goes out for a few weeks without internet connection?

The first thing flashed in my mind is GPS. I used ntp time sync in my server (the server that powers punknix.com and voyage mailing list) and configure it to point to GPS time sync source (clock.nc.fukuoka-u.ac.jp - stratum 1). So I know that GPS can be used for the time sync. After a short while, I got this link[2] from google.

The discussion[3] ended up suggesting that it is able to use Voyage Linux with gpsd. The gps/ntp solution is documented on their site[4], by using gpsd 2.32+ and SiRf3 GPS devices. Some suggested GPS devices are:

• BU-535 USB GPS Receiver
• Commell MP-954GPS Mini-PCI card

Once I acquired a GPS device, I am sure to give it a try!