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Your radio includes full Class D DSC capabilities. If you have a GPS device connected to the transceiver, your latitude and longitude and the current time are transmitted when you send a distress call or other type of DSC call. If you have manually entered your position information, your latitude, longitude, and time of entry are transmitted with the call. Having your location automatically transmitted prevents you from needing to identify your location in an emergency situation. Channel 70 is reserved exclusively for DSC calls, and your radio uses a dedicated receiver to maintain a constant watch on Channel 70. You do not need to change the channel to make a DSC call, since your radio automatically changes to Channel 70 to transmit a DSC call. Your radio sends the DSC data over Channel 70 in less than one second, and then tunes to the appropriate channel for voice communications. The icon is displayed when you have an incoming or missed DSC call. IMPORTANT: To use the DSC capabilities of your radio, you must first enter a Mobile Maritime Safety Identity (MMSI) number. An MMSI number identifies each DSC radio, like a telephone number. IMPORTANT: The radio disables DSC if you turn on ATIS. See page 12. Entering Your MMSI Number The Mobile Maritime Safety Identity (MMSI) number is a nine-digit code that acts as a DSC self-identification number, and is required in order to use the DSC capabilities of your radio. You can obtain an MMSI number from the telecommunications authority or ship registry for your country. In the USA, you can obtain an MMSI number from the following sources: • Federal Communications Commission (FCC)—assignments are recognized internationally • BoatU.S., Sea Tow, or United States Power Squadrons®—assignments are for USA waters only After obtaining your MMSI number, you must program the number into your radio to enable DSC. VHF 300 Series Owner’s Manual Digital Selective Calling Digital Selective Calling To enter your MMSI number: 1. Press the MENU key. 2. Select DSC > MY MMSI. 3. For each number in the sequence, turn the Channel knob clockwise to increase the number, and counterclockwise to decrease the number. Press the Channel knob to move to the next number in the sequence. Select ab to return to a previous character. 4. Select ACCEPT when you have entered your MMSI number. The radio prompts you confirm your entry. 5. Enter your MMSI number again, and select ACCEPT. If the MMSI numbers you entered do not match, the screen displays “MMSI NUMBERS DO NOT MATCH”. Select RETRY and repeat the process. If you do not want to enter your MMSI number at this time, select CANCEL. Viewing Your MMSI Number 1. Press the MENU key. 2. Select DSC > MY MMSI. 3. Select OK to return to the previous screen, or press the MENU key to return to the Home screen. DSC Distress Calls When you make a DSC distress call, your call is transmitted to all DSC-capable radios within receiving range. Your current GPS position (latitude and longitude) and the current time are included in the transmission if you have a GPS device connected to your transceiver. If you have manually entered your position information with the time, that data is transmitted with the call. For information on manually updating your position information, see page 26. NOTE: Familiarize yourself with the standard distress-call format and protocol to ensure that your calls are clear and effective. Sending an Undesignated Distress Call When you send an undesignated distress call, the nature of your emergency is not transmitted to the receiving stations. Sending an undesignated distress call is a shorter and quicker procedure that can save you time during an emergency. 1. Lift the spring-loaded door, and press and hold the DISTRESS key for at least three seconds. The transceiver beeps, and the screen displays “DISTRESS CALL COUNTING DOWN”. The channel pane counts down the seconds from 3 to 1. VHF 300 Series Owner’s Manual Digital Selective Calling Digital Selective Calling The radio automatically sounds an alarm, switches to Channel 70, and transmits your call on HI (25 W) power. You can press any key to turn off the alarm sound. 3. After transmitting your distress call, the radio automatically tunes to Channel 16 on HI (25 W) power. Press the PTT key on the handset and speak your message. The radio waits for an acknowledgement (ACK) on Channel 70 from a listening station. Sending a Designated Distress Call When you send a designated distress call, the nature of your emergency is transmitted to the receiving stations. 1. Lift the spring-loaded door and press the DISTRESS key. 2. Use the Channel knob to select the type of distress call: • UNDESIGNATED • FIRE • FLOODING • COLLISION • GROUNDING • CAPSIZING • SINKING • ADRIFT • ABANDONING • PIRACY • MAN OVERBOARD NOTE: To exit this screen without sending a designated distress call, press the CLEAR key to return to the Home screen, or press the 16/9 key (North American models) or the 16+ key (International ...

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