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Return To GPS FAQ Archive   What is Selective Availability - SA? Answered By Editor Selective Availability is a feature included in GPS. This is made intentionally to degrade signals that GPS receives. With the SA on, the accuracy of the GPS is lowered, while if it is off, the accuracy rate is higher. The SA was included in the GPS for the reason that during war, SA is supposed to be turned on so that the enemy will have lower accuracy level in determining their location. keywords: GPS | Global Positioning System | GPS System | Selective Availability | War Garmin Gpsmap 478 Garmin Gpsmap 76s

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