MARITIME MOBILE SERVICE IDENTITY (MMSI)

The Maritime Mobile Service Identity (MMSI) number is the nine-digit number used on marine radios like your VHF255S that are capable of using Digital Selective Calling (DSC). This number is used like a telephone number to call other vessels individually and automatically.

NOTE: You must get an MMSI assigned to you before you can perform this procedure, and you will ONLY be allowed to perform this operation once. You must enter your user MMSI before you can use the DSC functions. If there is no User MMSI stored and an attempt is made to use the DSC function of the radio, the LCD will display the following message:

DSC IS NOT

OPERATIONAL

PLEASE ENTER

MMSI

If you are a non-commercial user in U.S. waters (e.g. a recreational boater), you must obtain an MMSI from either BOAT US or SEATOW. The official sources of recreational MMSI numbers are: http://www.boatus.com/mmsi/ and http://www.seatow.com/boatingsafety/mmsiinfo.htm. They are both sanctioned by the FCC and the U.S. Coast Guard and are therefore the official points of registration for recreational MMSI numbers in the U.S.

NOTE: The following website is the official Coast Guard website that administers MMSIs. For full details of the rules and regulations of MMSI numbers, please visit: http://www.navcen.uscg.gov/marcomms/gmdss/mmsi.htm.

To obtain an MMSI assignment:

1.Contact BOAT US or SEATOW to obtain a unique MMSI number for your VHF255S radio. Go to: http://www.boatus.com/mmsi/ or http://www.seatow.com/boatingsafety/mmsiinfo.htm and follow the instructions.

2.When you have obtained your unique MMSI number, write it down IMMEDIATELY in the space provided on the inside front cover of this manual.

NOTE: You should also write down the serial number (found on the left panel of the radio base station) on the inside front cover of this manual, for future reference.

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Humminbird VHF255SW manual Maritime Mobile Service Identity Mmsi, To obtain an Mmsi assignment
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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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