without leaving marks

The GT51M-TM includes a 12-pin transducer with mounting hardware and installation instructions

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you can share information – for example charts

Garmin GT15M-IH Tec7 without leaving marksThe GT15M IH transducer is ideal for boats where the transducer is installed inside a fiberglass hull, and not on the stern where cavitation can cause problems. The transducer can be used with a bottom elevation angle between 0 and 25 degrees, and is excellent for boats moving at high speed that want to maintain accurate depth measurements. The 8 pin transducer with 4 plastic tanks has mid band CHIRP traditional sonar (85 165 kHz) and a nominal power