2. ADJUSTING SQUELCH

Squelch is used to eliminate static and background noise between received transmissions. Squelch effectively mutes the radio speaker until it receives a transmission, thus sparing you from having to listen to static. If Squelch is set too high, only the strongest transmissions can be heard, and if it is set too low, intermittent static and noise may be annoying. Squelch is controlled by the SQUELCH knob located on the radio base station.

To set Squelch:

1.Turn the SQUELCH knob counter-clockwise as far as it will go. You will hear a lot of static.

2.Then turn the SQUELCH knob clockwise until the static stops; this is the correct position for the SQUELCH knob.

3.Repeat steps 1 and 2 to re-adjust as necessary.

3.SELECTING A CHANNEL

Use the Up/Down key on the microphone handset or the CH/ENTER knob on the radio base station to scroll through the available channels. See Marine Channels for a list of channels and their frequencies.

To select a channel:

1.To select a channel, use the Up/Down key on the microphone handset or turn the CH/ENTER knob on the radio base station back and forth to find a channel. Stop when you find the desired channel.

NOTE: The channels you see will depend on which band you are in and whether you are in Memory or Normal mode. In Memory mode (MEM), you will only see the saved channels. See

10.Accessing Channels Saved to Memory for more information. If you wish to return to Normal Channel mode, press and hold the HI/LO/MEM key for 3 seconds, or press and release the CANCEL/WX key.

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Humminbird VHF255SW manual Adjusting Squelch, Selecting a Channel, To select a channel
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VHF255S, VHF255SW specifications

The Humminbird VHF255SW is an advanced VHF marine radio designed for reliability and performance on the water. It is built for recreational boaters, offering a combination of essential features and cutting-edge technologies that enhance communication and navigation safety.

One of the standout features of the VHF255SW is its robust 25-watt output power, which provides extended range communication, allowing users to reach distant vessels and shore stations effectively. This high power output is crucial in emergency situations or when out on open water, ensuring that skippers can maintain contact when it matters most.

The radio is equipped with a built-in Class D Digital Selective Calling (DSC) capability, which is designed to enhance safety. This feature allows users to send a distress signal automatically to the coast guard and other vessels within the vicinity, including their location coordinates. The DSC functionality can be a lifesaver in case of an emergency, providing peace of mind for boaters.

Another key characteristic of the VHF255SW is its large, high-contrast LCD display, which is easy to read even in bright sunlight or at night. The multi-color display features adjustable backlighting, ensuring users can navigate and communicate effectively in various lighting conditions. The intuitive user interface simplifies operation, making it accessible for even the most novice boater.

Additionally, the Humminbird VHF255SW is equipped with a built-in GPS receiver, which allows for enhanced positioning and mapping capabilities. This integration enables users to access real-time information, making navigation smoother and more efficient. The unit also supports navigating to specific waypoints and routes, making it an excellent tool for fishing and exploring new waters.

The radio is designed with a rugged, waterproof housing that meets IPX7 standards, meaning it can withstand submersion in water for short periods. This durability ensures that it operates reliably in rough marine conditions. The Humminbird VHF255SW also features a noise-canceling microphone for clearer communication, minimizing background noise during transmissions.

In summary, the Humminbird VHF255SW blends important marine communication capabilities with advanced technology. Its combination of high output power, DSC functionality, built-in GPS, and a user-friendly interface makes it an invaluable asset for any boating enthusiast, ensuring safety and confidence on the water. With its rugged design and reliability, the VHF255SW is a smart choice for those who demand quality and performance from their marine radio.
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