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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.
H
Thermocline
168 Manual Part 2.indd 01/09/01, 9:45 AM104