Garmin GPSMAP 168 Sounder User Manual

Page 118

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Appendix H

Understanding the Chart

Thermoclines

One of the unique features offered by GARMIN is See-Thru technology. See-Thru technology

allows the GPSMAP 168 Sounder to see through thermoclines and helps locate ﬁ sh where they live;
and ﬁ sh love the thermocline.

A rough deﬁ nition 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

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