How to Identify and Resolve Common Issues ?
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As required by the Radio Communications Act, all VHF marine radio operators, including those operating handheld radios, must have a Restricted Operator Certificate (Maritime) [ROC(M)].
Although not required in recreational boats under 65.5 feet long, a Very High Frequency (VHF) Marine Radio allows instant communication between your boat and other boats, marinas, bridges, and the United States Coast Guard (USCG).
For any marine VHF radio to work correctly a suitable antenna is necessary. Your choice of antenna will play a large role in how well your radio`s signal will be heard by other stations.
Because modern handheld VHF radios are often DSC-capable, they are able to be programmed with an MMSI number. A marine radio`s DSC capability is not able to be used without programming an MMSI into the radio prior to use.
The most important channels on your VHF radio are 13, 16, 19, 22, and 70. Channel 13 is used by commercial shipping to communicate their actions and confirm passage. Channel 16 (156.8 MHz) VHF-FM is designated by the FCC (Federal Communications Commission) as the national distress, safety and calling frequency.
Today, most VHF radios are DSC capable and easily recognized by the red button cover with the word “Distress” on it. To distinguish one vessel, or radio, from another, a unique identification number is assigned and must be programmed into the VHF radio.
Marine radios with GPS receiver
A GPS receiver for a VHF radio is highly recommended when using the DSC function. This is because DSC technology is based on a current position. If an emergency occurs at sea and you need to make a DSC distress call quickly, entering the GPS position is mandatory.
Boaters often mount radios with the legal limit of 25 watts and, depending on the height of the antenna, can reach communication distances as far as 60 miles or more. Everyone on the water should have a marine radio, however not everyone needs that much power while enjoying water activities.
If you are planning an offshore voyage, you need to know VHF radios and cellular telephones are limited in range, usually no more than 15 to 25 miles from shore.
Marine VHF applications require 50-ohm coax. TV cable is 75 ohm and is not suitable. Suitable cables include RG-58 (smallest), RG-8X, RG-8U and RG213. RG-213 is the same size as RG-8U but with completely waterproof and ultra-violet resistant insulation.
Use VHF channel 16, 27MHz channel 88, or HF frequency 4125 to make a distress call. Stay calm and clearly explain the problem, your position and the number of people on board. Follow the instructions Marine Rescue or the rescuing vessel give you.
While using AIS data, there is a chance that you may have encountered the duplicate vessel challenge. AIS does not enforce data integrity, so there are many vessels globally that, in their AIS messages, are transmitting the same MMSI and/or IMO number as other vessels.
Two-way radios offer closed communication networks and these networks are known to be difficult for hackers to access. The networks rely on radio frequency, not an internet connection and radio frequencies can be hard to trace through GPS but it`s not impossible.
VHF Marine Radio Channels
However, channel 16 on your VHF radio is probably the most important. Channel 16 is designated as the national distress, safety and calling frequency. All vessels should monitor this channel while underway.
Marine VHF Radios are two-way communicators that transfer and receive messages to and from the responding station. It has a VHF antenna which transmits high-frequency waves, measured in MHz. VHF radio can range up to 30 nautical miles if the antenna is high enough.
VHF Marine Radio Channels
However, channel 16 on your VHF radio is probably the most important. Channel 16 is designated as the national distress, safety and calling frequency. All vessels should monitor this channel while underway.
Marine VHF Radios are two-way communicators that transfer and receive messages to and from the responding station. It has a VHF antenna which transmits high-frequency waves, measured in MHz. VHF radio can range up to 30 nautical miles if the antenna is high enough.
There is a “procedure” for sending out a distress call, but all you really need to know is to turn your VHF to Channel 16 and high power, key the mike by pressing the talk button, and say one of the three phrases three times, along with position and situation information.