Please be more specific because they all transmit signals but the most common one is the radio wave because it transmits cellphone , televition and radio signals
The very first thing that you should do when a passenger on your boat falls overboard is to throw a PFD or also known as a Personal Flotation Device. This would include anything that can help the passenger to float. But this step would differ, only if the passenger is not wearing a lifevest.
<em>It's a test on Geography!
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