Internal, Garmin, 50/200Khz (Dual Frequency), 80/200Khz (Dual Beam)
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Chartplotter 431s with Dual-beam Transducer
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5" GPSMAP� 541s Chartplotter/Sounder with No Transducer
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GPSMAP� 441s Chartplotter/Sounder with No Transducer
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GPSMAP 421s Chartplotter/Sounder with No Transducer
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GPSMAP 521s Chartplotter with No Transducer
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GPSMAP Chartplotter / Sounder 531s with Dual-beam Tranducer, 5"
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GPSMAP 521s Chartplotter with Dual-frequency Transducer