Marine Radio Basics

What kind of range can I expect?
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 ...
Range of Cobra Marine Radios
It is difficult to provide a number, because range will be affected by the following factors:   Transmit power: Higher transmit power gets better range. ...
Marine Radio SWR
What is SWR? SWR is short for STANDING WAVE RATIO. It is a measure of how well the antenna is performing. Most problems with the antenna or antenna cabl...
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...
RF Exposure
Exposure to RF energy is always a concern. Concerns have been voiced about these and more:   High tension wires from the electric company X-rays at the ...
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...
Why should I register my VHF radio and obtain an MMSI number?
Your VHF radio is the single most important piece of safety equipment you can have on board your vessel. By using a VHF radio with Digital Select Calling (D...
Why is it so important to have a DSC radio with built-in GPS and/or the option to connect to an external GPS?
Having a built-in GPS in a emergency, one push of the Distress button, transmits the distress signal containing your MMSI# and location Lat/Lon information ...
Why join Sea Tow?
As the official VHF radio of Sea Tow, we recommend it. It is the #1 choice of boaters nationwide for boat towing and expert on-water assistance. Membership ...