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The starting point of any system is the receiver. Guidance begins with that receiver receiving raw GPS signals from satellites and a differential correction to that signal. Raw GPS tells the receiver approximately where it is, and the differential correction signal hones into its actual position. Fifteen-minute pass-to-pass accuracy is the range of accuracy that a customer will experience in typical conditions. For example, the SF1
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signal has a 15-minute pass-to-pass accuracy of 33 cm (13-in.) 95% of the time. This means that the accuracy of a StarFire iTC with SF1 signal will show a location 33 cm (13-in.) or less to its actual position 95% of the time and 16 cm (6.5-in.) or less 68% of the time. The signal accuracy that the customer is using helps determine the accuracy they can expect.
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