Confirming the acquisition to The Wall Street Journal, Apple spokesperson revealed that the fruity company acquires “smaller technology companies from time to time.” The spokesperson however didn’t reveal anything about the financial numbers about the deal, which according to estimates is pegged at $20 million.

WifiSLAM’s expertise in indoor location and mapping service can be of great help for Apple as the service would enable Cupertino to improve its Apple Maps service as well as prove to be a resource for the development of new Passbook service. WifiSLAM technology uses Wi-Fi signals to detect the user’s location inside a building with an accuracy of 2.5 meters using smartphones.

Apple, like Google, may be pursuing indoor mapping and wouldn’t want to leave any stone unturned. WiFiSLAM’s technology would probably help Apple gain some good faith from its otherwise angry maps customers.

According to June 2012 IMS Research Forecasts, by the end of the year 2016, Microsoft, Google and Apple will be three leading indoor mapping service provider companies with more than 120,000 indoor maps available for the use of the consumers.

Samsung Electronics, Qualcomm and Nokia are among some of the other companies which will jointly work to develop more advanced indoor locating services using both Wi-Fi and Bluetooth signals.