Precise Positioning Service (PPS) andStandard Positioning Service (SPS)

• Authorized users with cryptographic equipment and keys and specially equipped receivers use the Precise Positioning System. U. S. and Allied military, certain U. S. Government agencies, and selected civil users specifically approved by the U. S. Government, can use the PPS.

• PPS Predictable Accuracy

22 meter Horizontal accuracy

27.7 meter vertical accuracy

100 nsec time accuracy

• Civil users worldwide use the SPS without charge or restrictions. Most receivers are capable of receiving and using the SPS signal. The SPS accuracy is intentionally degraded by the DOD by the use of Selective Availability.

• SPS Predictable Accuracy

100 meter horizontal accuracy

156 meter vertical accuracy

340 nanoseconds time accuracy

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