Location based services is not a new way to detect any persons location and try offer this same person an added value services. Many companies has identified themselves as LBS or Location Based Services company that produces new applications, systems, management systems, billing systems, tracking and emergency services.

LBS or Location Based Service can be a great tool for marketer to enhance a true value need with new services based on locations.
Location Based Services:

Garmin
Loopt
Meetro
Smarter Agent
Socialight
Telenav
Trimble Outdoors
Trisent

These LBS firms try to reach these missions:

GSM localization
GPS Phone
Location-based media
Location-based games
Mobile dating
Mobile positioning