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NOTE: If you r lease the DISTRESS key b fore 3 seconds have passed, the Distress call will not be sent; if you hold down the DISTRESS key for more than 3 seconds, the Distress call will be sent whether channel 70 is busy or not. When a Distress call is sent, the acoustic alert sounds as a continuous tone until acknowledgement is received or you cancel the Distress call.

5.During the distress call sequence, the radio simultaneously watches Channel 70 (for a DSC acknowledgement) and Channel 16.

6.When the distress call is acknowledged, the acoustic alert will stop and the radio will return to normal operation on Channel 16, with high transmit power set.

7.If no acknowledgement is received, the unit continues to transmit the distress call at random intervals of 3.5 to 4.5 minutes until a response is received or the call is manually cancelled (by pressing the CANCEL/WX key for two seconds). In an emergency situation, when there is no DSC response, you should make manual MAYDAY distress calls between the automatic DSC calls as described in the next step.

8.Make sure that the radio’s transmit power is set to High by pressing the HI/LOW/MEM key if necessary.

9.Press and hold the PTT key and speak slowly, clearly, and calmly into the microphone and communicate the following information:

•MAYDAY MAYDAY MAYDAY.

•This is [name of your vessel, spoken three times and your call sign or boat registration number, spoken once].

•Repeat MAYDAY and [your ship’s name], spoken once.

•Describe where you are, providing latitude or longitude, or by bearing (true or magnetic, state which) and any information such as distance to nearby landmarks. Include any information on vessel’s course, speed and destination.

•Describe the nature of your distress (FIRE, FLOODING, COLLISION, GROUNDING, LISTING, SINKING, ADRIFT, ABANDONING, PIRACY, MANOVERBD).

•Describe the kind of assistance required.

•Provide the number of people onboard.

•Provide any additional information that may facilitate your rescue, such as the current condition of your vessel, your vessel’s size, color, hull type, number of people onboard needing medical attention.

•Say that you will be monitoring Channel 16.

•End your distress message by saying “This is [your ship’s name/call sign] OVER.”

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Humminbird VHF255SW manual Mayday Mayday Mayday, Say that you will be monitoring Channel
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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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