| http://www.w3.org/ns/prov#value | - The signals sent by GPS satellites are not able to reach deeply through solid objects, such as buildings, but the system works well outdoors.Until 1983, the system was not available to the general public, but after Korean Air Lines Flight 007 was shot down that year, after straying into the USSR's prohibited airspace, President Ronald Reagan issued a directive making GPS freely available for civil
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