Part 1 of Essay
or GPS is better known as "a satellite based radionavigational system developed and operated by the U.S. Department of Defense (DOD). permits land, sea, and airborne users to determine their three-dimensional position, velocity, and time twenty-four hours a day, in all weather, anywhere in the world with a precise and a ....

Part 2 of Essay
.... on a continuous, worldwide basis with no direct charge." (Tycho) The SPS is provided on the L1 frequency, which then will code a navigational message. The SPS accuracy is 100-meter horizontal, 156-meter vertical, and 340 nanoseconds time, and in total the SPS is ninety-five percent accurate. (Utexas) The Department of Defense also degrades this service so those consumers can use this service. Secondly, the Precise Positioning Service or PPS " is a highly accurate military positioning, velocity and timing ....