This module quickly gives your Titanium mobile application the ability to get the distance between two points on the globe. You can even track the device location and get updated distance value as it moves.
This module is great for apps that need to figure out if the device is within a certain range. Apps for pizza shop that need to figure out if device is in delivery zone or even apps that tell you if your in a wifi hotspot zone.
Full documentation and even a demo application.