14. DIGITAL SELECTIVE CALLING (DSC)

DSC (Digital Selective Calling) is a semi-automated method of establishing a radio call that has been designated by the International Maritime Organization (IMO) as an international standard for establishing VHF, MF and HF radio calls. It has also been designated part of the Global Maritime Distress and Safety System (GMDSS). This new service allows you to initiate or receive distress, urgency, safety and routine calls to or from another vessel equipped with a DSC transceiver.

NOTE: You will need to have a Maritime Mobile Service Identity (MMSI) assigned to you and entered into the radio before Digital Selective Calling features will work. Refer to the Maritime Mobile Service Identity (MMSI) and the DSC Setup, Enter Your User MMSI sections for more information.

NOTE: You will also need to have an optional-purchase GPS Receiver attached in order to take full advantage of the DSC features of your radio.

WARNING: This radio is designed to generate a digital maritime distress and safety call to facilitate search and rescue. To be effective as a safety device, this equipment must be used only within communication range of a shore–based VHF marine Channel 70 distress and safety watch system. The range of signals may vary, but under normal conditions, should be approximately 20 nautical miles.

To select a DSC call type:

1.Press the DSC/MENU key to display the DSC Call Type List, which you will use to select the desired DSC call type by rotating the CH/ENTER knob until the desired call type is highlighted, then pressing the CH/ENTER to execute your selection.

2.Only 4 calls can be displayed on the LCD at the same time; use the Up or Down Channel keys on the microphone handset or the CH/ENTER knob on the radio base station to view all the call types, until the desired call type is selected. Use the following table to make a specific type of DSC call. (DSC Call Type choices are: LAST CALL, NEW CALL, GROUP, ALL SHIPS, CALL LOG, DISTRESS LOG, POS REQUEST, EXIT.)

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Humminbird VHF255SW manual Digital Selective Calling DSC, To select a DSC call type
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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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