Getting Started
The Fishfinder 90 and 140 include the latest technology in interpreting bottom signals; they can see through fish, structures, and thermoclines (shown in the weakest hues). Even so, large schools of fish or dense structures close to the bottom can affect water depth return readings.
NOTE: If the Fishfinder is unable to track the bottom for any reason, the digits which indicate depth flash on and off to alert you that the Fishfinder is not tracking the bottom.
Along the top of the screen, you might see a grouping of intense hues. This area is surface clutter, which can be caused by waves or any other sonar interference at the surface of the water. Too much surface clutter can obscure your view of fish. You can turn down the Gain setting to reduce this surface clutter (page 15).
You can see in the previous illustration how the fish are indicated in a few different ways. By default, fish appear as arches. Actual fish returns might not always appear as perfect arches, due to the speed, fish orientation, or other conditions. You can also turn on the Fish Symbols setting if you want to see suspended targets indicated by a fish shape
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instead of arches (page 17).
Using Simulator Mode
Use Simulator Mode to practice and learn the operation of the Fishfinder. If the Fishfinder does not detect a transducer at startup, it automatically starts in Simulator Mode.
While in Simulator Mode, the Fishfinder displays a bottom scene, and you can control the Fishfinder (except the Gain and Auto Gain options) just as if it were on the water.
If no keys are pressed for two minutes, the Fishfinder automatically resets to default settings while in Simulator Mode.
To exit Simulator Mode, turn off the Fishfinder.
Fishfinder 90/140 Owner’s Manual
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