Location services with mavericks

You need to enable WiFi on your Mac.

And you need to be able to "see" a WiFi access point that has a location in Apple's WiFi location database.

You and your provider have nothing to do with it.

There is a database somewhere inside Apple which knows the locations of lots of Wireless Access Points around the world. When you enable location services, your Mac requests a location from that database based on the Wireless AP's it sees around your (the one you are connected to and any others it can "see"). If none of those access points are known to Apple, then it won't be able to locate your computer.

You don't have a GPS or Cellular phone chip in your Mac. It cannot derive the location on its own. It has to ask Apple's servers, and those servers must know the location of at least one base station that your Mac can "see."

Making any sense, now?

They used the Skyhook database quite a few years ago. Rumor has it they started their own, using cell phone locations, but I don't know if that is true. I submitted mine to that database way back when they started using that system. A couple of days later, I could locate my Mac.

If you wish to give it a try, here is the website: http://www.skyhookwireless.com/howitworks/submit_ap.php

I don't know how long it will take, if it even will happen.

Comcast/Xfinity doesn't know the location of your router.