Garmin GT15M-IH

Match the pin count on the sonar port of your sounder

Transom Mount: These are attached to the back (transom) of a boat hull. Alternatively, use the included equipment to install on a trolling motor.

In-hull: An in-hull transducer is installed inside a boat hull against the bottom

77/200 kHz sonar transmits a single ping at either 77 or 200 kHz 

50/200 kHz sonar transmits a single ping at either 50 or 200 kHz 

High-wide CHIRP has a frequncy range of 150-240 kHz in each transmission