Is the smartphone.
For example if you own an iPhone, there are so many apps for your traveling needs. Free and the paid apps are cheap. Like you want to give away the old Nokia.
The advance apps like this FlightTrack that track your flight status worldwide. With maps that you can zoom and it even help you to find alternate flight.
With current technology on smartphone, GPS is a standard, smartphone like HTC and iPhone can even work like a magnetic compass.
If you activate the Google’s latitude map, you can track down your spouse and friends by just open the google map or gmail…