Russian GLONASS offline for 11 hours

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On April 2, all satellites in the Russian GLONASS system broadcast corrupt information for 11 hours, rendering the GNSS constellation completely unusable for receivers worldwide. The disruption began just after midnight Russian time and lasted until noon, affecting global positioning, navigation, and timing services similar to those provided by the US GPS system. The cause of the failure is speculated to be a bad software update, though some discussions suggest the possibility of hacking. Service has since been fully restored.
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http://gpsworld.com/glonass-gone-then-back/

In an unprecedented total disruption of a fully operational GNSS constellation, all satellites in the Russian GLONASS broadcast corrupt information for 11 hours, from just past midnight until noon Russian time (UTC+4), on April 2 (or 5 p.m. on April 1 to 4 a.m. April 2, U.S. Eastern time). This rendered the system completely unusable to all worldwide GLONASS receivers. Full and correct service has now been restored.
Bad software update?
 
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What are the sats used for? I always assume a hacking these days :)
 

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