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The Android app won't get the new features initially, but O'Brien said the 4.3 version of Android has a way to use Bluetooth to determine location. That version came out in July and is in only a few devices, including Google's Nexus 7 tablet .
Fans can already use either app at stadiums to upgrade seats, buy copies of songs played over the loudspeakers and view maps and menus for vendors. A few stadiums even allow fans to order food and merchandise from seats.
O'Brien said iBeacon could eventually improve those features by letting the vendor know, for instance, where the fan is sitting without needing to enter the seat number.
Using iBeacon, MLB's app could also keep track of visits, even if the fan didn't check in or open the app. That way, it can extend different types of offers to first timers and regulars.
Those worried about privacy will be able to turn off location services for the entire device or for specific features. MLB also plans to offer additional settings in its app. Officials say the idea is to keep it to features fans want.
"We want to help out fans," O'Brien said. "We don't want to creep them out."
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