Vhf guard frequency. 0 MHz—the second harmonic of VHF guard—for military Jul 1, 2017 · What is the frequency supposed to be used for? 121. Oct 28, 2013 · My 480 can monitor another freq but you actually have to select the other freq (121. ) An emergency VHF / UHF (very high frequency / ultrahigh frequency) channel monitored as a secondary frequency by all air and ground stations in a geographical area. 0 are “guarded” frequencies reserved in the aircraft operations band exclusively for emergency communications and notifications. The frequencies are 121. Here is a quick look at the disparity between commercial/government Ham radios are commonly used in emergency situations. You’ll know the importance of these frequencies and how to use them. ) Many of these channels are dedicated to specific uses and therefore are unavailable for routine traffic. It provides the type of traffic or operations typically associated with each channel, such as coastguard communications, ship to ship safety communications, port operations, and public correspondence. after the talk is over. F. 5 MHz for civilian, also known as International Air Distress (IAD), International Aeronautical Emergency Frequency, [1] or VHF Guard, [1] and 243. Military Aircraft , the following procedures are to be followed: Follow the intercept's visual signals, contact Air Traffic Control immediately on the local frequency or on VHF Guard 121. The aircraft emergency frequency (also known in the USA as Guard) is a frequency used on the aircraft band reserved for emergency communications for aircraft in distress. ? Is it 121. All ships of length 20m or greater are required to guard VHF channel 13, in addition to VHF channel 16, when operating within U. 5 or UHF 243. a. May 6, 2013 · Being alerted by ATC if you failed to squawk VFR (1-2-0-0) when they released you. 5000 MHz for civilian, also known as International Air Distress (IAD) or VHF Guard, and 243. 0 kHz, 5371. It describes how VHF maritime channels are defined as used internationally. Aug 18, 2024 · VHF Channel 16 is the inter­national distress, safety and calling frequency. 7500/NAC293 was used as an airborne repeater during the 2011 National Level Exercise. LET GO of the microphone key to LISTEN!!! EMERGENCY AND HAILING CHANNEL: 16 Very high frequency (VHF) 121. 000 MHz to 162. 800 MHz):Coast Guard Emergency & Hailing – always monitored on the water VHF Channel 70 (156. Generally, civil aircraft are VHF radio equipped, and military are UHF radio equipped. Jun 8, 2025 · United States Coast Guard - Northern CA CGAS Sacramento (McClellan Airfield) Marine VHF Frequency Assignments IF AN AIRCRAFT IS INTERCEPTED BY U. Further noncompliance with interceptor aircraft or ATC may result in the use of force. I've included A-A freqs for selected units outside of the Mid-Atlantic such as some of the military flight demonstration teams as they can be used when these unit's aircraft transit through the Mid-Atlantic area. 2. 0 MHz for UHF. VHF Channel Information 156 to 162 MHz – channelized radio service (assigned channel frequencies) This document lists the international VHF marine radio channels and their corresponding frequencies. Oct 4, 2023 · The Guard frequency is exactly opposite: every ATC unit which monitors Guard monitors and can transmit on the same exact frequency, 121. 5 MHz, and UHF 243. Jun 21, 2024 · The airband typically ranges from 108 MHz to 137 MHz, covering VHF navigation and communication channels. Aug 2, 2025 · Discover essential marine radio frequencies for safe boating! Learn about VHF channels, emergency bands (Channel 16), DSC, and proper radio etiquette. 5 kHz, and 5403. There are several frequencies you might monitor in flight. Nov 11, 2003 · The guard channel is one that is programmed to a second (and independent) receiver within the radio which receives on the (chosen) guard frequency at all times regardless of the frequency in use by the operator. VHF Frequency and Usage Table Currently in the U. A large block of spectrum for maritime purposes is provided for in the VHF maritime mobile band. Coast Guard 24-Hour Emergency: (800) 246-7236 The National Interoperability Field Operations Guide (NIFOG) is a technical reference for emergency communications planning and for radio technicians responsible for radios that will be used in disaster response. 121. See our AIS article for information on this mode, and available decoders. Provide an air traffic service to AC in emergency or transit to a diversion aerodrome. Ships required to carry an Automatic Identification System (AIS) transceiver by the U. Jul 1, 2017 · What is the frequency supposed to be used for? 121. Coast Guard regulations enacted pursuant to the Maritime Transportation Security Act of 2000. Federal Communications Commission regulations require boaters having VHF radios to maintain a watch on either channel 9 or channel 16, whenever the radio is turned on and not communicating with another station. 8 MHz and is received worldwide by any VHF radio. Below is a comprehensive list of commonly used airband frequencies and their purposes. Radios I used in the military, you just select "both" and it automatically monitors guard. government agencies, the Federal Communications Commission, the National Telecommunications and Information Administration, and the U. Explore M. A frequency followed by G means that you're listening to that specific frequency plus the guard frequency, but only transmitting on the specific freq. U. ’ Marine VHF radio is a worldwide system of two-way radio transceivers on ships and watercraft used for bidirectional voice communication from ship-to-ship, ship-to-shore (for example with harbormasters), and in certain circumstances ship-to-aircraft. 5110. 4 days ago · The U. 15 MHz) to ensure automatic switch over of VHF sets to Driver Guard communication channel in case of calling station master failed to switch over the channel manually within 5 sec. VHF Channel 16 (156. Sep 15, 2023 · Tow boats of more than 7. Jul 12, 2016 · The frequencies are 121. 5, 243 and 406 MHz are reserved around the world and are known as international aeronautical emergency frequencies. 0 MHz—the second Radio frequency reserved for aeronautical emergencies Very high frequency (VHF) 121. 800 MHz), 2182 kHz, 4125 kHz, 6215 kHz, etc. 525 MHz):DSC Digital Distress (for radios with DSC) U. Jun 5, 2023 · In an emergency situation involving boats or ships, ham radio operators can use this frequency to establish communication with the coast guard. The guard frequencies 121. Feb 1, 2026 · The VHF high band frequencies are used in conjunction with local/regional/state interoperability systems on VHF. 0), and "GV" is for VHF guard (121. 500MHz in the VHF band. Aug 3, 2025 · Explore essential marine radio frequencies for safe boating! Learn about VHF channels, emergency frequencies (Channel 16), DSC communication, and proper radio etiquette. If you have a VHF radio on your boat, Federal Communications Commission (FCC) regulations require that you maintain a watch on either VHF Channel 09 or 16 whenever you are underway and the radio is not being used to communicate on another channel. See the Federal Communications Commission's Marine VHF Radio Channels page. The main uses of a VHF radio are: Distress calling and safety Ship to shore communications Navigation (vessels to bridges, etc. 5 OR UHF GUARD 243. May 9, 2009 · Yesterday while listening to 6673 hf from San Franciso I heard them ask one plane out over the pacific to contact another on the vhf guard frequency and have them contact SF on 6673 hf. ’. The regulatory framework that regulates channel arrangements and uses in Australia is This advisory circular strongly encourages aircraft owners to upgrade their very high frequency (VHF) air / ground radio communication systems. territorial waters. and V. They should not be used for normal voice messages or general conversation. and disseminate up to date w airfields within the UK FIR. Coast Guard actively monitors VHF channels, particularly Channel 16 (the distress channel), and requires commercial vessels to carry VHF radios. Understand regulations, licensing, and how to use your radio effectively for navigation and maritime safety. The FCC page does not include frequency information, but has more complete information on the use of the channels. 3 Other Links Oct 5, 2024 · Such scenarios may include being out of an area covered by VHF radio, or issues caused by geography/topography or meteorological conditions. ’ Emergency frequency and messages Introduction The international emergency frequency is 121. . Dec 31, 2021 · 航空应急频率（英语：aircraft emergency frequency，也称GUARD）是航空波段上保留的一个用于遇险飞机通信的频率。 VHF Radios Very High Frequency (VHF) Radios Very High Frequency (VHF) radios have been around for many years and remain the primary means of communication for vessels throughout the United States. Read the article to learn about its uses. The value of 121. This circular also describes and updates civil air traffic control frequencies in the VHF (118. Aug 10, 2022 · Frequency 121. Aircraft emergency frequency explained The aircraft emergency frequency (also known in the USA as Guard) is a frequency used on the aircraft band reserved for emergency communications for aircraft in distress. Channel usage in the Solent and Southampton Water has some differences from that in other areas so we have compiled this guide. 5 or UHF Guard 243. Some areas link the VHF, UHF and 800 MHz frequencies together, or patch them to trunking systems. Oct 3, 2018 · VHF Channel 16 is the international distress frequency; it broadcasts on a frequency of 156. 975 MHz) band. 0. Very high frequency (VHF) 121. 5. This guide covers coastal communication, navigation, weather broadcasts, and understanding maritime radio regulations for enhanced safety at sea. There are a total of 73 channels listed along with their transmit and receive frequencies in Facilities for Practice Emergency procedures on UHF and VHF Guard. 3 Recommendation. Frequencies are obvious, channels are less so (relies on ME/flight planning setup pre-mission), "G" is for UHF guard (234. 1 Federal Aviation Administration 10. Coast Guard broadcasts coastal forecasts and storm Warnings of interest to the mariner on VHF channel 22A following an initial announcement on VHF channel 16. United States Coast Guard United States Maritime Administration USCG USCG US VHF Marine Channels USCG International VHF Marine Channels USGC VHF Narrowband Channels FCC FCC Maritime Mobile Services 47 CFR 80. 5 MHz in areas or over routes where the possibility of interception of aircraft or other hazardous situations exist, and a requirement has been established by the appropriate authority. Search and Rescue alerting service for both Military and Civil ac on UHF and VHF Guard. The aircraft emergency frequency (also known as guard) is a frequency used on the aircraft radio band reserved for emergency communications for aircraft in distress. 5 am. It shall be used for emergency purposes only. The NIFOG includes rules and regulations for use of nationwide and other interoperability channels, tables of frequencies and standard channel names, and other reference material Jun 21, 2024 · The airband typically ranges from 108 MHz to 137 MHz, covering VHF navigation and communication channels. An emergency VHF / UHF (very high frequency / ultrahigh frequency) channel monitored as a secondary frequency by all air and ground stations in a geographical area. What is the vhf guard freq. Air Guard is not to be used for tactical communications, local dispatching, administrative, flight-following or logistical use, unless it is the only way to communicate in order to identify another frequency for communications. VHF/UHF Frequencies used by military entities in the Mid-Atlantic (MD/DE/DC/VA/PA/NJ) as of 30 June 2020 Jul 22, 2023 · Notes 121. GUARD is an old denomination that should not be used any more (Rules of the Air). Some of the frequencies listed may not be currently active. 5 MHz for VHF and 243. Not only does the AIM recommend it, it’s actually required by FDC NOTAM. All non-emergency traffic should be communicated on another channel (not channels 9 or 16 VHF Radios Very High Frequency (VHF) Radios Very High Frequency (VHF) radios have been around for many years and remain the primary means of communication for vessels throughout the United States. 5 MHz for civilian, also known as International Air Distress (IAD), International Aeronautical Emergency Frequency, or VHF Guard, [1] and 243. I’ll explore the main airport frequencies in detail to help you understand their ideal applications. Ham radios are commonly used in emergency situations. What'd you use in the Mig? VHF Marine Radio Channel Reference PUSH the microphone key to talk. Jul 5, 2021 · Scanner Frequencies and Radio Frequency Reference for Common Aviation (United States) 4 days ago · The U. Coast Guard; and two international organizations, the International Telecommunications Union and the International Maritime Organization; have each established marine radio watch keeping regulations. Apr 5, 2025 · 1 VHF Allocation - 118-137 MHz 2 Common Civilian Frequencies 3 Common Military Frequencies 4 ARINC En Route Service 5 Aircraft Communications Addressing and Reporting System (ACARS) 6 Balloon Operations 7 Airline Operations 8 Conventions for Abbreviating Frequencies 9 See Also 10 External Links 10. 5 and ultra high frequency (UHF) 243. Jan 30, 2024 · Marine VHF radios, or Very High-Frequency radios, are specifically designed for use on the water and offer instant communication between boats, marinas, bridges, and the United States Coast Guard. 5). 5 MHz is a guarded frequency, hence the “Guard” comment you constantly hear. 0, AND COMPLY WITH THE INSTRUCTIONS GIVEN BY THE INTERCEPTING AIRCRAFT INCLUDING VISUAL SIGNALS IF UNABLE RADIO CONTACT. Studies have shown that VHF radio remains a primary tool for distress alerts at sea, outpacing other communication methods in critical situations. Feb 1, 2025 · When etching contrails over the oceans and other remote areas of the world, airline pilots monitor a pair of VHF frequencies. Select VHF Channel 16, 2182 KHz, or other emergency frequency used where you operate. Nov 14, 2024 · Emergency frequency 121. The aircraft emergency frequency (also known in the USA as Guard) is a frequency used on the aircraft band reserved for emergency communications for aircraft in distress. Coastal Radio Stations and Frequencies, focusing on non-commercial stations handling traffic operations. 5. 500 (guard) Is commonly used to get the attention of an aircraft that has gone to the wrong frequency, or a VFR (non-ATC controlled aircraft) that is about to fly into a restricted area, as all aircraft are supposed to monitor guard if they have an available radio. VHF Marine Radio Frequencies Important Note Anyone who intends to listen to radio transmissions should be aware that licence is not required for a radio receiver as long as it is not capable of transmission as well. 2 Aeronautical Data and Aircraft Tracking 10. 5, is certainly one of them. Some channels are duplex (D), separate transmit and receive frequencies. 150 HMX-1 Base Ops (FM) 31. on VHF out to 30 miles on MF out to 150 miles Read the Maritime and Coastguard Agency (MCA) guide to maritime safety information, which includes information on broadcast frequencies. ) Aug 27, 1998 · See Marine Radio Watch Requirements for further information. Failure to follow these procedures may result in interception by military aircraft. there are approximately 49 VHF channels available plus 7 additional channels dedicated to NOAA WX Radio and (2) for use of the Automatic Identification System (AIS. 313 Frequencies for Immediately contact ATC on an appropriate frequency, VHF Guard 121. 5 MHz is often known as GUARD CHANNEL, simply called "Guard" by most users - analogous to VHF marine channel 16 (156. 000 to 136. Most channels are simplex (S), same frequency used for transmission and reception. As such, pilots and air traffic controllers must rely on precise radio frequencies to avert disaster. US Coast Guard VHF/UHF Frequencies Back in early 2008, the Coast Guard began using new narrow-band radios, capable of APCO P-25 digital mode as well as analog. S. You using Guard to ask ATC for another frequency if they gave you a ‘next’ frequency not appropriate for your area of flight (it happens – I’ve heard airliners calling ATC on Guard because they needed an appropriate frequency). This set will have priority channel scan (Guard Driver communication channel with station master at frequency 161. However, both emergency frequencies are available to any aircraft properly equipped. The NOTAM states that, ‘all aircraft operating in the United States national airspace, if capable, shall maintain a listening watch on VHF guard 121. 100 Helo A-A-NJ area (FM) 30. 5 MHz, also known as the guard frequency, is reserved for civil aviation emergencies. 1 MHz VHF FM (Broadcast frequency) The U. Guard, a. 0 MHz, identified as Military Air Distress (MAD) or UHF Guard. — Jun 27, 2023 · Very High Frequency (VHF) Frequencies in the very high frequency band are most widely used for domestic aircraft communications at the present time. Should an aircraft make either a PAN call or a Mayday call and it goes unanswered, pilots can resort to using a VHF guard frequency. When the new radios went on line, so did some new frequencies. k. Oct 5, 2024 · Such scenarios may include being out of an area covered by VHF radio, or issues caused by geography/topography or meteorological conditions. One is the emergency frequency, 121. 0 and comply with the instructions given by the intercepting aircraft including visual signals if Immediately contact ATC on an appropriate frequency, VHF Guard 121. 5 kHz are frequencies that are used for emergency communication during disasters, such as earthquakes and hurricanes. Aircraft operations are considered high risk, and have a very high priority when communications assets are assigned. 121. 5 MHz. Marine VHF Radio Channels US and International Marine radio uses narrow band frequency modulation (NFM) for voice communications, and can be received by most analog radio scanners. Emergency frequency: air traffic controller use Jan 26, 2023 · The aviation emergency frequency is a radio frequency designated for use by aircraft in emergency situations. Recreational boaters would continue to call the Coast Guard and any commercial facility on channel 16. 900 Helo A-A International VHF Marine Radio Channels and Frequencies The following table is adapted from the International Telecommunications Union Radio Regulations Appendix 18, including changes adopted by the 2019 World Radio Conference. 500 Helo A-A-NJ area (FM) 32. MILITARY AIRCRAFT AND FLARES ARE DISPENSED, THE FOLLOWING PROCEDURES ARE TO BE FOLLOWED: FOLLOW THE INTERCEPT'S VISUAL SIGNALS, CONTACT AIR TRAFFIC CONTROL IMMEDIATELY ON THE LOCAL FREQUENCY OR ON VHF GUARD 121. Jan 31, 2005 · If an aircraft is intercepted by U. Sep 3, 2023 · For military use, the dedicated emergency frequency is 243. BE Aug 5, 2023 · In the high-stakes world of aviation, miscommunications can lead to catastrophic consequences. 0000 MHz for military use, also known as Military Air Distress (MAD) or UHF Guard. The National Interoperability Field Operations Guide (NIFOG) is a technical reference for emergency communications planning and for radio technicians responsible for radios that will be used in disaster response. The other is a discrete air-to-air frequency used to exchange pilot reports and information with other flights. Aeronautical radiocommunication service, R (Route) service. CB radios (Citizens Band radios), on the other hand, are regularly used in vehicles for communication purposes and operate on a different frequency Sep 3, 2021 · Here are VHF-FM non-commercial channels recreational boaters may use in specific situations. Frequency use will be documented on the ICS-205 (Incident Radio Communications Plan) and on ICS-220 (Air Operation Summary) forms. This will connect you to local emergency responders and the Coast Guard as required. 0, and provide your aircraft identification, position, and nature of the flight. 1. Both communication and VOR navigational systems are operated on VHF frequencies. It is the second harmonic of VHF Guard, which allows aircraft transmitting on this frequency to enhance the potential of reaching both military and civilian monitoring stations in extreme circumstances. The emergency frequency is called GUARD in IVAO ATC client. 050 MHz, apart from those portions within this frequency range that are allocated to the land mobile service. Three U. Users may be fined by the FCC for improper use of these channels. I have left them in the list in case they are re-used. 8 meters in length on navigable waterways; and, Uninspected commercial fishing industry vessels required to carry a VHF radio. The NIFOG includes rules and regulations for use of nationwide and other interoperability channels, tables of frequencies and standard channel names, and other reference material Ch 22A 157. The VHF maritime mobile band consists of channels operating in the frequency range 156. 0 MHz for military operations, are monitored by ATC and others, including maritime agencies. We would like to show you a description here but the site won’t allow us. 300 Helo A-A-NJ area (FM) 32. It is used for distress and emergency calls as well as for informational broadcasts from the Coast Guard. 5 is that someone is always listening—every ATC facility monitors it. Jun 29, 2024 · Coast Guard Aviation Coast Guard Auxiliary Nationwide VHF Some or all channels may use encryption full- or part-time at various locations around the US. 航空应急频率（英语：aircraft emergency frequency，也称GUARD）是航空波段上保留的一个用于遇险飞机通信的频率。 Below is the frequency channel allocation to the VHF Marine Channel Frequencies Channel NoFunctionShips FrequencyShore Frequency0UK Search and Rescue156 MHz156 MHz1Public correspondence and Port Op… Dec 10, 2018 · Maritime Operations Marine VHF 1-87 Channels listed here are the Canadian recognized 25kHz spaced channels from 1 to 87, and are the most widely used. Get a list of popular ham radio emergency frequencies, available as a PDF. Mar 27, 2024 · See Marine VHF Band Plans for the difference between US, Canadian, and International channels. Proper use of the VHF channels is an important safety factor. If you notice any discrepancy between these two lists, please notify us at [email protected]. H. Dec 16, 2020 · National Guard - Digital VHF Operations 148. ANG Air National Guard ArNG Army National Guard ARTCC Air Route Traffic Control Center FACSFAC Fleet Area Control & Surveillance Facility RCAG Remote Communications Air/Ground TRACON Terminal Radar Approach Control 30. Jan 26, 2023 · The aviation emergency frequency is a radio frequency designated for use by aircraft in emergency situations. The purpose of the FCC regulation was to relieve congestion on VHF channel 16, the distress, safety and calling frequency. 2 Aircraft shall continuously guard the VHF emergency frequency 121. Some channels are not available in all areas or regions and are noted as such in the description field This will include the request and assignment of all aircraft frequencies. The frequency is commonly referred to as “Guard” and it is 121. vuwd iynjsum gtdrv hwds vbyb bcnvmpr oxhq lyg ebcus glyf