Digital Selective Calling (DSC)

VHF Marine Radio Protocols

For Example

The vessel Corsair calling the vessel Vagabond:

Corsair: “Vagabond, this is Corsair (station license number call sign).”

Vagabond: “Corsair, this is Vagabond. Over.”

Corsair: “Vagabond go to working Channel 68. Over.”

Both parties switch over to the agreed upon working channel....

Corsair: “Vagabond I need to talk to you about... Over.”

Vagabond: “Corsair in answer to your question about... Over.”

Corsair: “Vagabond, thanks for the information about... (call sign and out).”

After each transmission, say “OVER” and release the microphone Push to Talk (PTT) button. This confirms that the transmission has ended. When all communication with the other vessel is totally completed, end the message by stating your call sign and the word “OUT.” Remember, it is not necessary to state your call sign with each transmission, only at the beginning and end of the message.

NOTE

For best sound quality at the shore station or other vessel receiving your call, hold the microphone/speaker at least 2 in. (51 mm) from your mouth and slightly off to one (1) side. Speak in a normal tone of voice.

Digital Selective Calling (DSC)

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Digital selective calling (DSC) is a semi-automated system for establishing a radio call. It has been designed by the International Maritime Organization (IMO)

as an international standard for VHF, MF and HF calls and is part of the Global Maritime Distress and Safety System (GMDSS).

DSC will eventually replace aural (listening) watches on distress frequencies and will be used to announce routine and urgent maritime safety information broadcasts. Until DSC is fully implemented, it is still necessary to maintain a listening watch on Channel 16.

The DSC system allows mariners to instantly send a distress call with GPS position coordinates (requires a GPS receiver to be connected to the radio) to the Coast Guard and other vessels within range of the transmission.

DSC also allows mariners to initiate and receive distress, urgent, safety, routine, position request, position send and group calls between vessels equipped with DSC capable radios.

Maritime Mobile

Service Identity (MMSI)

VHF Marine Radio Protocols

Maritime Mobile Service Identity (MMSI)

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The MMSI Number Is Available In The U.S.A. From Any Of Two (2) Sources:

■Sea Tow International: 1-631-765-3660 – www.seatow.com

■BoatU.S.: 1-800-563-1536 – www.boatus.com/mmsi

An MMSI is a nine (9) digit number used on a marine radio capable of using digital selective calling (DSC). It is used to selectively call other vessels or shore stations and is similar to a telephone number.

For your CobraMarine™ radio to operate in the DSC mode, you must enter your maritime mobile service identity (MMSI) number. See page 51 for instructions on how to enter it.

In Canada, Contact:

■Industry Canada Spectrum Management Office (only available on the Internet): http://strategis.ic.gc.ca/epic/internet/insmt-gst.nsf/vwGeneratedInterE/sf01742e.html

To Obtain An MMSI Number Outside The U.S.A.:

Users can obtain an MMSI from their country’s telecommunications authority or ship registry. This may involve amending or obtaining a ship station license.

WARNING

This equipment is designed to generate a digital maritime distress and safety signal 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 to distress and safety watch system. The range of the signal may vary, but under normal conditions should be approximately 20 nautical miles.

 

 

Nothing Comes Close to a Cobra® 9

 

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Cobra Electronics MR F80B-D owner manual Digital Selective Calling DSC, Maritime Mobile Service Identity Mmsi
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MR F80B-D specifications

The Cobra Electronics MR F80B-D is a compact and feature-rich fixed mount VHF marine radio designed specifically for boating enthusiasts and maritime professionals. Renowned for its robust construction and innovative technology, this radio ensures reliable communication over marine channels, even in adverse weather conditions.

One of the standout features of the MR F80B-D is its built-in GPS, which provides real-time location tracking. This functionality is crucial for ensuring safety on the water, allowing users to quickly and accurately communicate their position in case of emergencies. The built-in GPS also supports DSC (Digital Selective Calling), which is an essential safety feature that enables users to send distress signals with just a push of a button, instantly alerting nearby vessels and coast guards.

The Cobra MR F80B-D is designed with user-friendliness in mind. Its large, easy-to-read display ensures that critical information is visible, even in bright sunlight. The intuitive navigation menu allows users to switch between channels and settings with ease. Its robust weatherproof construction guarantees continued operation in harsh marine environments, protecting it from saltwater, humidity, and extreme temperatures.

Additionally, the MR F80B-D incorporates a noise-canceling microphone that enhances voice clarity, ensuring that communications are crisp and clear. It features 10 NOAA weather channels, providing real-time weather updates, helping users stay informed about changing weather conditions while on the water. The built-in dual watch feature allows simultaneous monitoring of two channels, ensuring that no important communications are missed.

For those who need to stay connected to their devices, the MR F80B-D comes equipped with a USB charging port, making it straightforward to charge smartphones or other devices on board. The radio operates on both 25 watts and 1 watt, allowing users to select the appropriate power level based on their needs and proximity to other vessels or coastal facilities.

In conclusion, the Cobra Electronics MR F80B-D is a versatile and reliable marine radio that offers a combination of advanced features, including built-in GPS, DSC functionality, and a user-friendly interface. Its durability and ease of use make it an excellent choice for both recreational boaters and maritime professionals, ensuring secure and effective communication on the water.
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