This feature lets you track users' locations. For example, an employee who is out in the field completing a job such as meeting a client. Couple this with time-tracking and you have an employee efficiency tracker. You get the idea.
Maps lets you place the location data so that it makes sense to the user visually. or even use it to assign location-based activity. No explanation required we assume.
Camera lets you record videos or capture photos. Imagine coupling this with a sales mans site visit.
Trigger events when people enter or exist marked areas or boundries such as n kilomters from the desitination.