Marine Radio FAQs

What is the range of my cobra marine radio?
It is difficult to provide a number, because range will be affected by the following factors: Transmit power: Higher transmit power gets better range. Tran...
What kind of antenna do I need?
You will need a marine antenna, designed for the marine band. A CB antenna will not work. For availability, check with local boat dealers and marinas. Make ...
I cannot access one or more marine channels.
Please note that your Cobra marine radio has 3 different channel maps: USA Channel Map – this channel map provides access to channels commonly used in the ...
I am not able to communicate.
Please note that certain channels are intended for simplex operation, while others are intended for duplex operation. SIMPLEX – uses the same frequency for...
Can I connect an external antenna to my handheld radio?
The following models can use an external antenna: Models:  MR HH300, 325, 400, 415, 425 The antenna connector on your radio is a type “SMA female”.  This...
I hear excessive noise from the radio.
Noise can be caused by a variety of sources, such as: Atmospheric noise Engine noise (from the ignition system or from the alternator) Any kind of elect...
How to reset a Cobra handheld marine radio.
If your handheld radio is not operating properly, the following describes how to reset the radio to factory settings. MR HH90, MR HH100, MR HH200 Hold ...
What is DSC (Digital Selective Calling)?
Digital Selective Calling (DSC) is a radio technology allowing enhanced distress radio messages to be sent digitally. In addition, a DSC equipped vessel wit...
What is a Maritime Mobile Service Identity (MMSI)?
Maritime Mobile Service Identity (MMSI) is a unique 9 digit number that is assigned to a (Digital Selective Calling) DSC radio or an AIS unit. Similar to a ...
Is there a fee to obtain an MMSI?
MMSI numbers are free for BoatUS members or $25 for non-members. To obtain a new or change your existing MMSI#, visit the BoatUS website.