Apple has spent some of its money acquiring indoor GPS company WifiSLAM. The two-year old start-up has developed a technology to detect a smartphone's location in a building using Wi-Fi signals.Related StoriesiPad 5 rumor rollup for the week ending 22 MarchApple updates Podcasts app, adds custom stations, playlists, iCloud sync, ditches tape deck designApple warns 'we will reject apps that aren't iPhone 5
