Selecting a ChannelYou can select an International, Canadian, or USA channel.Turn the dial.Transmitting with the Radio1 Select an appropriate channel.2 Verify that the channel is clear.NOTE: You cannot obstruct the communications of other people due toFederal Communications Commission (FCC) and international guidelines.3 Select PTT on the handset.appears at the top of the screen.4 Speak into the handset.NOTE: Five minutes is the maximum time allowed for transmission. After fiveminutes of transmitting, PTT is disabled until you release PTT.5 Release PTT.Setting the Receiving SensitivityYou can control the receiving sensitivity of the radio. When you have noise inhigh-traffic areas or areas with electromagnetic interference, such as near cell-phone towers, you can set the receiving sensitivity to LOC to decrease receiversensitivity. In remote areas and on open water, you can set the receivingsensitivity to DIST to ensure that you use the maximum range of the receiver.1 Select HI/LO.2 Select an option:• Select LOC to enable local sensitivity.• Select DIST to enable distant sensitivity.Switching Between 1 W and 25 W Transmitting ModesYou can control the transmitting power of the radio. Low (1 W) is used for localtransmissions, and high (25 W) is used for distance and distress transmissions.When two signals broadcast on the same frequency, a VHF radio receives onlythe stronger of the two signals. You should transmit calls other than distress callsusing the lowest power setting that allows you to communicate, to reduce thepossibility that your transmissions interfere with the transmissions of others.In the USA frequency band, transmissions on channels 13 and 67 must be low(1 W) by default.In the International channel band, transmissions on channels 15 and 17 must below (1 W), and the radio does not allow transmissions on these channels to bechanged to high (25 W).1 Select HI/LO.2 Select 1W or 25W.Digital Selective CallingNOTE: Before you can use DSC capabilities, you must enter a Mobile MarineSafety Identity (MMSI) number. An MMSI number identifies each DSC radio, likea telephone number.Digital Selective Calling (DSC) is a key component of the Global MaritimeDistress and Safety System (GMDSS). DSC enables VHF radios to place andreceive digital calls directly with other vessels and shore stations, including theUSA and Canadian Coast Guards. Your radio includes full Class-D DSCcapabilities.For more information about DSC on your device, including using DSC for distresscalls, see the online owner's manual (page 6).NOTE: The device disables DSC automatically when you turn on ATIS(page 5).Entering Your MMSI NumberNOTICEYou can enter your MMSI number only once. If you must change your MMSInumber after entering it, you must take your radio to your Garmin®dealer forreprogramming.4 Quick Start Manual