Presented by :
Eng/Ayman Wael Elashmawy

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Maritime Mobile Service Identities (MMSI)
DSC radios MUST receive an MMSI to function properly
Uniquely encoded nine digit number with vessel/owner’s information (like a phone number)
Stores vessel information, owner, etc…
Identifies and helps find boater in a distress situation
Coast Guard maintains database for distress information retrieval
Store other vessels MMSI’s into your radio (like a ‘contact list’)
You have to know a boater’s MMSI to call them
It is FREE
Only takes a few minutes
Once you obtain your MMSI, enter it into your DSC radio
Some radios only give you two chances; however, a boater can obtain a manufacturer ‘re-set’
Communications on the Water
VHF
Used & Monitored By U.S. Coast Guard
New GMDSS models registered so automated distress call can identify your boat & location
FM - Static Free
Line Of Sight - 10-30 Miles
25 Watts Maximum Power
Relatively Inexpensive
GMDSS Defined Sea Areas
Selecting Your VHF-FM Radio
Sensitivity
Selectivity
Audio output
Signal strength
Signal suppression
Selecting Your VHF-FM Radio
Line of sight transmission
Available channels
Channel selector
Installation
What are some important considerations when installing a VHF radio and antenna?
VHF Marine Radio Channels
Using a marine radio
Calling
Select channel – usually 16
Listen – determine channel not in use
Press to talk (PTT) button
Name Of The Boat You Are Calling
“This Is (Name Of Your Boat)”
“Over”
Release PTT button & listen
The Phonetic Alphabet
Phonetic Numerals
Using a marine radio
Digital Select Calling (DSC) radio
Select working channel
Press DSC button
Choose or enter MMSI number to call
Radio changes to Ch 70 & calls
Radio reaches vessel you called
Both radios change to working channel
Radio sounds alert
Press PTT & start communication. Working channel may be in use; pick another
VHF Spoken Distress calls
There are three different spoken distress calls that can be made on the radio:
MAYDAY
PAN-PAN
SECURITY
Sending a distress call
All calls are sent in a similar way
VHF Radio – ICOM 602 Most popular radio according to SSCA
References:
CANADIAN COAST GUARD AUXILIARY – PACIFIC.
United States COAST GUARD AUXILIARY – PACIFIC.
http://itu.int/publ/R-REC/en. (Rec. ITU-R M.493-13).
Gulf coast Island Packet Association Rendezvous 2010.
NAVICOM company products.
jojoeland.com
Marine VHF Radio
Easy to use
Good clear reception
Reasonable range of coverage for small vessels
Most vessels over 10 metres are fitted with VHF sets
Low power requirements make battery operation possible
VHF facilitates reasonable antenna sizes
Portable and handheld sets are readily available
The Relatively low cost of appliances has lead to their great popularity