and DOWN ARROW symbols to the left of the menu indicate which buttons are available for adjustment. In menus which have numerous possible settings such as depth range, a range of adjustment indicator shows the total range available and the current setting. Within the menu are the options available. The selected option or current setting is highlighted in the black box. If no adjustment is made, this will be the selected setting. Pressing one of the ARROW buttons while the menu is on-screen selects another option.

Several of the menus are multi-step. In some situations if an adjustment is made, additional options become available for further adjustment. Examples of these multi-step menus are Depth Range, Depth Alarm and Zoom. See the detailed description of each function for further explanation.

MENU FUNCTIONS

Sensitivity

The Sensitivity function controls the sensitivity of the sonar receiver. The 100SX automatically adjusts the level of receiver sensitivity based on a number of factors including the depth of the water and the level of noise present. Noise can be caused by other electronic devices, engines, trolling motors, propeller cavitation and hydrodynamic flow among others.

The user has the option of biasing

this Sensitivity adjustment either higher or lower based on personal preference. You can select one of 11 sensitivity bias settings from -5 to +5. A bias setting of 0 (Factory Setting) has no effect on the automatic sensitivity control. Increasing the bias (+1 through +5) causes the unit to display the information from progressively smaller sonar returns. By decreasing the sensitivity bias (-1 through -5), the unit effectively filters small sonar returns.

In murky or muddy water, it is often advantageous to reduce the sensitivity bias. This prevents the display from being cluttered with sonar returns from debris or suspended particles. In very clear or very deep water, it may be desirable to increase the sensitivity bias since even the smallest sonar return may be of interest to the user.

To adjust Sensitivity, press MENU repeatedly until the Sensitivity heading is displayed. When the Sensitivity menu appears, use the UP ARROW to increase the sensitivity bias, or the DOWN ARROW to reduce sensitivity bias. By holding either ARROW button depressed, the unit will sequence through the available settings until you release the button or the end of the adjustment range is reached. If additional time is needed to study a menu, press and hold the MENU button and the menu will remain onscreen indefinitely.

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Humminbird 100SX manual Menu Functions
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100SX specifications

The Humminbird 100SX is a versatile and user-friendly fish finder designed for anglers seeking an efficient and reliable tool for locating fish and navigating waterways. This compact device combines advanced technology with an intuitive interface, making it an ideal choice for both novice and experienced fishermen.

One of the standout features of the Humminbird 100SX is its wide-spectrum sonar technology. Utilizing dual-beam sonar, the 100SX provides exceptional detail and clarity in underwater imaging, allowing users to detect fish and structure beneath the surface with ease. The device can operate at multiple frequencies, ensuring optimal performance in various fishing environments. This dual-beam capability enables a wider coverage area, enhancing the chances of locating schools of fish.

The 100SX comes equipped with a 4-inch grayscale display that boasts a high-resolution screen, providing crisp visuals and clear readings even in diverse lighting conditions. This easy-to-read display helps anglers monitor underwater activity and water depth, making it easier to track fish movements and identify potential hotspots.

Additionally, this fish finder includes a built-in fish alarm feature, alerting users when fish are detected within the designated depth range. This handy function allows for a more efficient fishing experience, keeping anglers focused on their catch. The 100SX also features a deep-water capability of up to 600 feet, providing ample range for both shallow and deep-water fishing expeditions.

Navigational aids are also a highlight of the Humminbird 100SX. The device is equipped with a precise and responsive GPS system, allowing users to mark waypoints and create custom routes. This feature is invaluable for returning to fishing spots or navigating unfamiliar waters, enhancing the overall fishing experience.

In terms of design, the Humminbird 100SX is built for durability and ease of use. Its robust construction ensures it can withstand the rigors of outdoor conditions while remaining lightweight and portable. Installation is straightforward, making it accessible for users of all skill levels.

Overall, the Humminbird 100SX is a reliable and effective fish finder that combines innovative sonar technology with practical features. Its ease of use, detailed imaging, and navigational capabilities make it a valuable tool for anglers looking to maximize their fishing success on the water. Whether you are a weekend warrior or a seasoned pro, the Humminbird 100SX is an excellent addition to any fishing setup.
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