Senator Al Franken, a Democrat from Minnesota, sent a letter to Apple chief executive Steve Jobs on Wednesday, while Democratic Representative Edward Markey of Massachusetts sent Jobs a letter on Thursday.

The letters came after a pair of British security researchers, Alasdair Allan and Pete Warden, said the position-logging feature is contained in iOS 4, the operating system for the iPhone and iPad released in June.

Meanwhile, The Wall Street Journal reported that Google's Android smartphones also regularly transmit their locations back to Google.

Google and Apple are storing location information to help them tap the $2.9 billion market for location-based services, according to the paper.

In a statement, Markey said Apple "needs to safeguard the personal location information of its users to ensure that an iPhone doesn't become an iTrack.

"Collecting, storing and disclosing a consumer's location for commercial purposes without their express permission is unacceptable and would violate current law," he said.

In his letter to Apple, Markey asked whether the researchers' report was accurate and, if so, how the company was using the information being collected.

Markey asked for a response within 15 business days.

According to Allan and Warden, iOS 4-equipped iPhones and iPads store latitude and longitude coordinates along with a time stamp, probably through cell-tower triangulation.

They noted that cellphone companies typically have access to this data but it is not usually stored on a mobile device itself.

The Journal cited research firm Gartner Inc., which said the location-information market is expected to rise to $8.3 billion in 2014.

earlier related report
Apple devices logging movements: researchers
Washington (AFP) April 20, 2011 - A pair of British security researchers said Wednesday that the latest version of Apple's operating system for the iPhone and the iPad is constantly recording the location of the devices and storing the information in a hidden file.

Alasdair Allan and Pete Warden said the position-logging feature is contained in iOS 4, the operating system for the Apple devices which was released in June of last year.

"Ever since iOS 4 arrived, your device has been storing a long list of locations and time stamps," they said in an article posted at the website radar.oreilly.com.

"We're not sure why Apple is gathering this data, but it's clearly intentional," the researchers said, adding that it raises a number of "security and privacy implications."

"By passively logging your location without your permission, Apple have made it possible for anyone from a jealous spouse to a private investigator to get a detailed picture of your movements," they said.

"What makes this issue worse is that the file is unencrypted and unprotected, and it's on any machine you've synched with your iOS device," they said. "It can also be easily accessed on the device itself if it falls into the wrong hands.

"Anybody with access to this file knows where you've been over the last year, since iOS 4 was released," they said.

Allan and Warden announced their findings at the Where 2.0 conference in San Francisco. They were first reported in The Guardian newspaper.

Allan and Warden said they had contacted Apple's product security team about their findings but had not heard back.

They said the device stores latitude and longitude coordinates along with a time stamp, probably through cell-tower triangulation,

They noted that cellphone companies typically have access to this data but it is not usually stored on a mobile device itself.

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