Imagine a text-message alert sent to a prospective homebuyer's mobile phone informing the buyer that there is a house in the immediate vicinity that fits the criteria they are seeking. The buyer saunters over to the house and calls the broker. Easy.
And it is made possible by geo-fencing, a GPS-tracking tool.
Geo-fencing currently exists to create a virtual perimeter GPS boundary around a physical geographic area. If someone leaves the area boundary, a notice (alert) is sent to disclose the departure outside the area, either by mobile phone or e-mail.