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

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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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Contents Operations Manual Thank YOU Operator Warnings Table of Contents Setup Menu Maintenance Troubleshooting VHF255S Introduction HOW VHF Radio WorksFeatures Overview Page Maritime Mobile Service Identity Mmsi To obtain an Mmsi assignmentGroup Mmsi VHF255S Controls Radio Base Station Front Page VHF255S Controls Radio Base Station Rear VHF255S Controls Microphone Handset Whats on the Display 10 11Indicates current channel selected Dot Matrix Indicates special conditions or radio functionsInstallation Overview Parts SuppliedRadio Base Station Watt VHF255S Fixed Mount radio base stationMicrophone Handset Microphone handsetCables Connections Overview Decide Where to Install the Radio Base Station Install the Radio Base Station Radio Base Station Mounting Screws Gimbal Knobs Bracket Dash Nuts Recessed mounting brackets Attach the Antenna Cable to the Radio Install the Microphone Mounting BracketConnected to the radio before powering up the radio Mount the microphone onto the bracket Attach a GPS Receiver OPTIONAL-PURCHASE Using Your VHF255S Before YOU USE Your Radio You will need to obtain an FCC license ifTo turn on the radio To select a channel Adjusting SquelchSelecting a Channel Selecting U.S./INTERNATIONAL/CANADIAN Bands Selecting HIGH/LOW PowerTransmitting and Receiving Selecting a Weather Channel and Turning on Weather Alert To delete channels from memory Accessing the 16/9 Priority ChannelsADDING/DELETING Channels TO/FROM Memory Accessing Channels Saved to Memory Using the Transmit TIME-OUT Timer TOTTo access saved channels ScanningTo activate scan modes Using the Watch Monitor Modes Digital Selective Calling DSC To select a DSC call typeExit Quits the DSC Call Type menu mode DSC Call TypesTo make a Group call Group MmsiMaking a Distress Call Open the red cover over the Distress keyMayday Mayday Mayday Say that you will be monitoring ChannelMaking Individual Routine Calls Press the CH/ENTER key to initiate the call 4a. If the call is acknowledged, press PTT to talkTo receive a Distress call Receiving CallsTo receive a DSC call To receive a Distress Relay call To receive an All Ships callTo receive a Group call Call data is stored in the Call LogTo receive an Individual call To receive a Geographic Area callTo acknowledge a missed call Resetting the RadioPosition Indication Distress 23’20.1234 N 100’15.1002 E 0810PM UTC Setup Menu To access the Setup Menu Contact ListTo delete an entry from the Contact List Backlight Adjustment LOCAL/DISTANTContrast Adjustment To adjust the ContrastGPS/TIME Submenu GPS/TIME Submenu Manually Enter GPS Data GPS/TIME Submenu Settings Submenu GPS/TIME Settings Submenu Position Display ON/OFFGPS/TIME Settings Submenu Time Display ON/OFF GPS/TIME Settings Submenu Time Offset Local TimeGPS/TIME Settings Submenu Time Format Radio Setup Submenu To edit an existing channel name entry Radio Setup Channel Name Display and EditingTo display an existing channel name Radio Setup Ring Volume Adjustment Radio Setup Beep Volume Adjustment Radio Setup Turning the Internal Speaker ON/OFFDSC Setup Submenu To access the DSC Setup SubmenuDSC Setup Enter Your User Mmsi Group Mmsi DSC Setup Create and Manage Group Mmsis To enter Group MMSIsTo edit an existing Group Mmsi entry To delete a Group MmsiDSC Setup Individual Reply DSC Setup DSC EnableDSC Setup Position Reply DSC Setup ResetVHF255S Doesnt Power UP MaintenanceTroubleshooting LOW Receiver Sensitivity Transmitting is Impossible Or High Power CAN’T be SelectedNo Sound from the Speaker Year Limited Warranty Humminbird Service Policy Returning Your Unit for Service Receiver SpecificationsTransmitter Marine Channels UseMarine Channels 157.350 161.950 International Marine Channels MHz 156.125 160.725 Canadian Marine Channels Commercial Fishing Only DSC Call Type List These menu choices appear when you press the DSC/MENU keyMenu Tree Setup Menu Page Page Page Contact Humminbird Monday Friday 800 a.m. to 430 p.m. Central Standard Time
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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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