Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
The beacons are indicated by red circles. The set of plausible curves used for location determination are shown as dashed curves, and the object location at the unique intersection of the plausible curves is indicated by a green star.
