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When you Zoom while the unit is in manual depth Range Zoom
mode, you can select one of 13 pre-set Zoom Sizes. This lets you
enlarge some other particular segment of the water column.
Zoom Size menu with the 5-15 foot zoom selected. The boat is in 28 feet
of water, but the screen has zoomed in on the water column from 5 to
15 feet below the surface.
Sensitivity
Sensitivity controls the unit's ability to pick up echoes. If you
want to see more detail, try increasing the sensitivity, a little
at a time. There are situations when too much clutter
appears on the screen. Decreasing the sensitivity can reduce
the clutter and show the strongest fish echoes, if fish are
present. As you change the sensitivity setting, you can see
the difference on the chart as it scrolls.
These figures show results of different sensitivity levels on the same
location. Fig. 1: Sensitivity at 98 percent, determined by Auto
Sensitivity. Typical of full auto mode. Fig. 2: Sensitivity set at 71
percent. Fig. 3: Sensitivity set at 47 percent. Fig. 4: Sensitivity set at
100 percent.
Enlarged fish arches
Fig. 1 Fig. 2