Google will track Santa this year. Google Earth will have a Santa Tracker. However, for the more traditional, military approach to know where Santa is, there is NORAD:
“… The tradition began in 1955 after a Colorado Springs-based Sears Roebuck & Co. advertisement for children to call Santa misprinted the telephone number. Instead of reaching Santa, the phone number put kids through to the CONAD Commander-in-Chief’s operations “hotline.” The Director of Operations at the time, Colonel Harry Shoup, had his staff check the radar for indications of Santa making his way south from the North Pole. Children who called were given updates on his location, and a tradition was born.”
link: Why we track Santa
additional link: NORAD Tracks Santa
And while NORAD is tracking Santa, may you have a safe and joyous holiday.