Figure 5.
Smart-phone utility interfaces. (a) Positioning on Map, (b) Access point registration, and (c) Wi-Fi sensor registration.
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.