New Internet Probe Can Track within Hundreds of Meters

In New Scientist: a new method claims to be able to track someone on the Internet within 690 meters.  Note this has nothing to do with GPS on a mobile device, but probes the infrastructure of the net to approximate a location of say a laptop.  Also a good discussion of current accuracies of location capabilities.  Have followed  these capabilities for some time for retail applications. The privacy implications are interesting here. Does it keep me from cloaking my location within the accuracy of the probe?