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Thermoclines On the Water Understanding the Chart One of the unique features offered by GARMIN is See-Thru™ technology. See-Thru™ technology allows the Fishfinder 100 to see through thermoclines and helps locate fish where they live, and fish love the thermocline. A rough definition of a thermocline is a break in water where the water temperature changes faster than the water above it. The thermocline usually displays as a gray level as shown below. Thermocline 32 100 On the Water.p65 32 2/16/00, 10:08 AM