Hi,
You should think of Multiple GUP list
New features and functionality in Symantec Endpoint Protection Release Update 5 (SEP RU 5) Group Update Provider (GUP)
http://www.symantec.com/business/support/index?page=content&id=TECH96417&locale=en_US
Best Practices with Symantec Endpoint Protection (SEP) Group Update Providers (GUP)
http://www.symantec.com/business/support/index?page=content&id=TECH93813
We have a video as well to learn more about location awareness:
Configuring location awareness in SEPM console.
http://www.symantec.com/connect/videos/location-awareness
If GUP's are not availble then following article can help you to learn what next can be done.
Configuring mobile computers to automatically download definitions when disconnected from the Symantec Endpoint Protection 12.1 Management console
http://www.symantec.com/docs/TECH177361