HDI stands for Hybrid Dual Imaging- meaning that these transducers offer both Sonar and DownScan Imaging. DownScan Imaging provides for a high-detail view of underwater structure directly below the transducer. There are two different sonar options: 83/200kHz (max 150m depth) or 50/200kHz (max 500m depth). There are different mounting options: transom-mount, or trolling-motor mount (requires the additional trolling motor adapter).
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