STANDALONE GPS definition
STANDALONE GPS means the mode of operation of a GPS subsystem in which acquisition and tracking of the GPS satellite signals is performed based solely on the following: (1) information acquired directly from the GPS satellite constellation during that acquisition, tracking or position computation, or (2) information stored within the GPS subsystem which was acquired directly from the GPS satellite constellation during previous acquisition or tracking of the GPS satellites, or (3) information entered manually by an operator. The acquisition or tracking or position computation referred to in the previous paragraph must be performed without network, wireless or other aiding, that is, without access by the GPS subsystem to information from sources external to the GPS subsystem, such as (a) information related to the GPS satellite constellation including GPS time, frequency, ephemeris, almanac, and similar information received by another GPS or other system from the GPS satellite constellation and relayed to the GPS subsystem by any means, or (b) any other information used for acquisition and/or tracking received from a source external to the GPS subsystem, such as motion or position of the GPS subsystem. For the avoidance of any misunderstanding, a GPS subsystem utilizing signals from a local oscillator or other timing device for acquisition or tracking of the GPS satellite constellation is not operating in a STANDALONE GPS mode if such local oscillator or other timing device receives information, such as GPS time, frequency and/or synchronization information, from a source other than the GPS subsystem. For purposes of this definition 1.12, the GPS subsystem only includes a TCXO reference clock and/or a Real Time Clock (“RTC”) that are not calibrated to hold or be synchronized by GPS time.