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U.S. Patent Apr. 24, 2001 Sheet 2 0f 7 US 6,222,484 B1 GPS L1 VHF Antenna Antenna 22a 26 GPS Digital Signal Processor Crystal 27 Oscillator Serial 23 Data H Radio 2 1 Microprocessor Comm Address-bus Lines <—> Selim Data Control Lines Power Supply Circuit (supplies all 32 components) \—____———__—_————_ _——___-n__——‘ + - 31 Battery Pack 29 10 gain Equipment Housing 28 30 Serial Indicator Activation "0 Lights switch Figure 2A J
