Tracking apps for phones are nothing new, but most of them require a computer to see where the other person is. A new iPhone app called Whereoscope make tracking much easier, and by working in the background, could allow for surreptitious snooping.
Whereoscope lets you set up what are called Geofences for your kid's frequently visited spots such as school or a friend's house, and when they move outside those zones you will get a message to let you know. The clever part, is that by only switching on the GPS when the kid is moving, Whereoscope doesn't run the phone's battery down too fast, and its operation is completely invisible to the kid.
This all sounds fine when it comes to young kids, but what if a suspicious spouse installs Whereoscope on their partner's iPhone to see where they are hanging out? Unless the person checks to see what programs are running in the background, they might be oblivious about being tracked.
The main catch right now is that both ends require an iPhone running iOS4.
Whereoscope is available now in the iPhone App Store.