OFF-SENS Adjustment

NOTE: The Humminbird In-Dash Sixty has a noise reject system built in.

NOTE: A large number of modern fishing boats are now equipped with two depth sounders, one

of which is mounted on the console with the transducer positioned near the back. The second unit is positioned in front with the transducer mounted off the foot of the trolling motor. Occasionally, when both units are being operated with full gain, there will be a revolving signal flashing around one or both dials. This is a result of an overlap of signals due to the expanding cone angle of the transducer (See Figure 11). This same condition will occur when you pull alongside of another boat with its depth sounder in operation. This signal will not affect the performance of the unit and can usually be eliminated by reducing the amount of sensitivity. To avoid the possibility of the intermingling signals, the transducers should be positioned as far apart as possible upon initial installation.

Refer to illustrations on page 18 as you read the following paragraphs.

Move the boat out into 5 to 10 feet of water. Shut off the boat motor and any electronic device that may cause electrical interference. Turn the NOISE REJECT knob fully counterclockwise. Turn the OFF-SENS knob just past the click. The dial should flash at 0 feet (see indication A). Turn the knob clockwise as needed to get a good lake bottom flash at the water depth (see indication B). Turn the knob farther clockwise and echoes will appear (see indication C). As a rule of thumb, adjust the sensitivity clockwise until you see the second echo (indication C). This will normally give you good bottom and fish returns.

In order to allow readings in very shallow water (one to five feet) the SENS control has a special taper which requires that it be turned almost fully clockwise to read depths over 30 to 40 feet. This in no way means that your unit is not sensitive as it will read depths up to 200 feet. This control does, however, allow more control of your signal at shallow depths.