Garmin Marine have a range of transducers to suit you needs. Click on the link below to download a detailed guide for you to peruse at you level. 
There are several types of sonar available, each with special capabilities. And each requires a different transducer to work most effectively. For optimum performance, it is very important to match the transducer to your device’s sonar.
To start, make sure the transducer you are buying pairs with your unit, and what type of sonar technology you would like to add. Read
through each section to learn more about the sonar technologies and transducers recommended by Garmin.
SONAR TECHNOLOGY
• Accessories
• Smart Sensors
• NMEA 2000®
PANOPTIX LIVESCOPE™ Our award-winning Panoptix LiveScope sonar brings real-time scanning sonar to life. It shows highly detailed, easy-o-interpret live scanning sonar images of structure, bait and fish swimming below and around your boat in real time, even when your boat is stationary. Full capabilities are available with the Panoptix LiveScope System (see below). The Panoptix LiveScope™ LVS12 transducer provides an economical solution for your GPSMAP® 8600xsv chartplotter — without the need for a black box -- with 30-degree forward and 30-degree down real-time scanning sonar views. Includes a compact GLS 10 sonar black box with LVS32 transducer and simple plug-andplay
Garmin Marine Network connector to install easily and integrate seamlessly with your compatible Garmin chartplotter1. Use the transducer as a supplemental traditional and ClearVü sonar source to see a historical representation of structure and fish below your boat. Available with trolling motor, transom and thru-hull mount transducer options.