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GROL practice questions

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Question 1FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

An FCC General Radiotelephone Operator License (GROL) is issued for what term?

  1. Five years
  2. Twenty years
  3. Ten years Correct answer.
  4. The lifetime of the licensee

Explanation

Commercial radio operator licenses issued under Part 13 of the FCC rules carry a term of ten years. The license must be renewed if the holder wishes to continue operating after that period expires.

Question 2FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

Which marine VHF frequency is designated as the international distress, safety, and calling frequency?

  1. 156.650 MHz
  2. 156.800 MHz Correct answer.
  3. 156.525 MHz
  4. 157.100 MHz

Explanation

Channel 16 at 156.800 MHz is the international radiotelephone distress, safety, and calling frequency for the maritime mobile service. It is monitored by the Coast Guard and by most vessels afloat.

Question 3FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

On a vessel that is legally required to carry a radiotelephone station, who must hold a commercial radio operator license?

  1. Only the vessel's owner
  2. The operator actually transmitting Correct answer.
  3. Any amateur licensee aboard
  4. Only the vessel's master

Explanation

The FCC requires the individual who actually operates the transmitter at a compulsory ship station to hold the appropriate commercial operator license. Holding a license is a personal qualification and is not transferred with the vessel or the equipment.

Question 4FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

When an FCC representative inspects a ship radiotelephone station, the operator's license must be:

  1. Surrendered to the inspecting officer
  2. Available at the station for inspection Correct answer.
  3. Entered in the station log only
  4. Mailed to the FCC district office within ten days

Explanation

FCC rules require the license document to be kept at the station or carried by the operator so that it can be produced on demand. An inspecting officer is entitled to see it during an inspection.

Question 5FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

The radiotelephone distress signal 'MAYDAY' indicates that a station is:

  1. In grave and imminent danger Correct answer.
  2. Sending a routine navigational warning
  3. Testing a transmitter on a working channel
  4. Requesting a medical consultation

Explanation

MAYDAY is the international radiotelephone signal of distress and is used only when a vessel or person is threatened by grave and imminent danger and immediate assistance is required. It takes absolute priority over all other transmissions.

Question 6FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

During the international silence periods on the 2182 kHz radiotelephone distress frequency, transmissions are prohibited for:

  1. Ten minutes beginning at midnight UTC
  2. Three minutes at the top and bottom of the hour Correct answer.
  3. Five minutes beginning at each quarter hour of UTC time
  4. One minute at the start of each hour

Explanation

Silence periods of three minutes duration begin at each hour and each half hour on the MF distress frequency 2182 kHz. These periods are reserved for distress, urgency, and safety traffic so that weak distress calls can be heard.

Question 7FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

Marine VHF Channel 70 (156.525 MHz) is reserved for what use?

  1. Commercial public correspondence
  2. Digital selective calling Correct answer.
  3. Intership navigation communications
  4. Bridge-to-bridge maneuvering

Explanation

Channel 70 is set aside exclusively for digital selective calling and radiotelephone voice transmission is not permitted on it. DSC is used for automated distress alerts and routine station-to-station calling.

Question 8FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

A 406 MHz emergency position indicating radiobeacon carried aboard a US vessel must be registered with:

  1. NOAA's beacon registration database Correct answer.
  2. The US Coast Guard district office
  3. The Federal Communications Commission
  4. The International Telecommunication Union

Explanation

406 MHz beacons are registered in the National Oceanic and Atmospheric Administration's beacon registry so that rescue coordinators can identify the vessel and contact its owner. The FCC licenses the ship station but does not maintain the beacon registry.

Question 9FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

Which international body adopts the Radio Regulations that govern use of the radio spectrum among nations?

  1. The International Maritime Organization (IMO)
  2. The World Meteorological Organization
  3. The International Electrotechnical Commission
  4. The International Telecommunication Union Correct answer.

Explanation

The International Telecommunication Union is the United Nations agency that adopts the Radio Regulations, which allocate frequency bands and set operating procedures internationally. FCC rules implement these provisions for US stations.

Question 10FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

A ship radiotelephone station must identify itself by its assigned call sign:

  1. Only at the end of each exchange
  2. At the start, end, and at intervals Correct answer.
  3. Once during each four-hour watch period
  4. Only when the receiving station asks for it

Explanation

Station identification is required at the beginning and end of each communication and at reasonable intervals during a long exchange. This lets other stations and monitoring authorities know who is transmitting.

Question 11FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

Which transmission is prohibited by the FCC's radio rules?

  1. A request for a medical evacuation
  2. Obscene, profane, or indecent language Correct answer.
  3. A weather report relayed for another vessel
  4. A call to a shore station by radio

Explanation

The Communications Act and FCC rules prohibit obscene, indecent, or profane language on the radio. Such transmissions can result in monetary forfeitures and license consequences.

Question 12FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

An application for a new ship station license in the maritime radio service is filed with the FCC on which form?

  1. FCC Form 605 Correct answer.
  2. FCC Form 499
  3. FCC Form 323
  4. FCC Form 854

Explanation

FCC Form 605 is the consolidated application used for authorizations in the ship, aircraft, amateur, and commercial operator radio services. It supports new applications, modifications, renewals, and related filings.

Question 13FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

A citizen of a foreign country who operates a ship radiotelephone station in the US maritime service generally must hold:

  1. A General Radiotelephone Operator License
  2. An amateur extra class operator license
  3. No license, if the vessel is US-flagged
  4. A Restricted Radiotelephone Operator Permit Correct answer.

Explanation

FCC rules require alien operators to hold a Restricted Radiotelephone Operator Permit before operating radio stations covered by the rules. The permit is issued without an examination and is limited to the operator's own use.

Question 14FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

Which of the following communications has priority over all other transmissions?

  1. Routine public correspondence calls
  2. Navigational warnings to shipping
  3. Scheduled meteorological broadcasts
  4. Distress calls and distress messages Correct answer.

Explanation

Distress traffic has absolute priority over every other type of communication, and all stations must cease transmitting if they may interfere with it. Urgency and safety traffic rank next in that order.

Question 15FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

Transmitting a false distress signal is:

  1. Prohibited and subject to heavy penalties Correct answer.
  2. Excused when the operator is unlicensed
  3. Permitted during transmitter testing
  4. Permitted if no interference results

Explanation

Knowingly transmitting a false distress signal is prohibited and can lead to severe civil and criminal penalties as well as license revocation. It also diverts search and rescue resources from genuine emergencies.

Question 16FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

Which frequency is designated for aircraft emergency and distress communications, and is also monitored in many maritime distress situations?

  1. 121.500 MHz Correct answer.
  2. 518.000 kHz
  3. 156.800 MHz
  4. 406.025 MHz

Explanation

121.500 MHz is the international aeronautical emergency frequency and is guarded by many aircraft and rescue coordination centers. It is often used to coordinate with aircraft assisting in a maritime distress.

Question 17FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

The FCC rules governing stations in the maritime radio services are found in which part of Title 47 of the Code of Federal Regulations?

  1. Part 15
  2. Part 87
  3. Part 80 Correct answer.
  4. Part 90

Explanation

Part 80 of Title 47 contains the rules for stations in the maritime services, including ship and coast stations. Operators should consult it for licensing, operating, and technical requirements.

Question 18FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

A foreign-flagged vessel operating in US waters with a radio station aboard is required to:

  1. Follow the FCC's technical rules only while in a US port
  2. Comply with the ITU Radio Regulations and US rules Correct answer.
  3. Obtain a new US ship station license from the FCC
  4. Surrender its foreign ship license to the FCC on arrival

Explanation

Foreign vessels are licensed by their home administration, but while in US waters they must operate in accordance with the international Radio Regulations and applicable FCC requirements. They do not obtain a separate US ship station license.

Question 19FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

A station must use the minimum transmitter power necessary to carry out the desired communication in order to:

  1. Avoid paying additional regulatory fees
  2. Extend the life of the vessel's battery
  3. Avoid causing harmful interference Correct answer.
  4. Satisfy ship station licensing conditions

Explanation

FCC rules require the lowest power that will accomplish the communication reliably so that unnecessary interference is avoided. Power may be increased only when conditions genuinely require it.

Question 20FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

Under the GMDSS, Sea Area A1 is defined as the area:

  1. Within range of an MF coast station
  2. Within VHF coast station DSC coverage Correct answer.
  3. The waters of the Great Lakes only
  4. Within range of a NAVTEX transmitter

Explanation

Sea Area A1 is the area within radiotelephone coverage of at least one VHF coast station in which continuous DSC alerting is available. It is roughly the first 20 to 30 nautical miles from shore in most implementations.

Question 21FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

Under the Communications Act, what restriction applies to radiotelephone communications not intended for the public?

  1. They must not be divulged without authorization Correct answer.
  2. They must be sent to the FCC each month
  3. They must be recorded in a public log
  4. They may be retransmitted for any commercial purpose

Explanation

The Communications Act requires that the contents of non-public radio communications not be divulged or used by persons who receive them. This protects the privacy of message traffic handled by common carrier and private stations.

Question 22FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

For a ship radiotelephone station, final responsibility for its proper operation rests with:

  1. The radio operator on watch alone
  2. The equipment manufacturer
  3. The licensee and the vessel's master Correct answer.
  4. The FCC district office

Explanation

The licensee is accountable to the FCC for the station, while the vessel's master has authority over and responsibility for proper operation aboard ship. Operational errors can be charged against both.

Question 23FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

Your marine VHF transmission has been reported to be interfering with a nearby coast station. Under FCC rules, what should you do?

  1. Wait for a written FCC order to change
  2. Reduce power or eliminate the interference Correct answer.
  3. Increase power to override the other station
  4. Continue and log the report for the FCC

Explanation

A station causing harmful interference must take immediate steps to eliminate it, including reducing power, changing frequency, or ceasing transmission. Waiting for an FCC order is not acceptable when interference exists.

Question 24FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

The radiotelephone urgency signal 'PAN-PAN' is used when:

  1. Safety is at risk with no immediate danger Correct answer.
  2. A routine radio check is being conducted
  3. A vessel is in grave and imminent danger
  4. A navigational warning is being rebroadcast to ships

Explanation

PAN-PAN announces an urgency situation concerning the safety of a vessel or person that does not present an immediate danger and does not require immediate assistance. It ranks below distress traffic but above all routine traffic.

Question 25FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

Before transmitting on a marine radiotelephone channel, a station should:

  1. Listen to be sure the channel is not in use Correct answer.
  2. Transmit a carrier for five seconds
  3. Announce the call sign continuously for one minute
  4. Change frequency twice before calling

Explanation

Stations must listen on the channel before transmitting so that distress, urgency, or other priority traffic is not interrupted. This practice is the practical basis of the distress-channel monitoring obligation.

Question 26FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

Marine VHF Channel 16 (156.800 MHz) is designated primarily for which purpose?

  1. Distress, safety and calling Correct answer.
  2. Bridge-to-bridge navigational coordination
  3. Digital selective calling and distress alerting
  4. Commercial ship-to-shore telephone calls

Explanation

Channel 16 is the international radiotelephone distress, safety and calling frequency. Initial contact is established there and, once contact is made, traffic is normally moved to a working channel.

Question 27FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

An FCC ship station license in the maritime radio service is normally issued for what term?

  1. Five years
  2. Two years
  3. Ten years Correct answer.
  4. The lifetime of the licensee

Explanation

Part 80 of Title 47 provides that ship station licenses are normally issued for a term of ten years and must be renewed to remain valid. A lifetime term applies to operator licenses, not to station licenses.

Question 28FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

Which FCC authorization is required to operate a marine radiotelephone aboard a vessel that is not required by law to carry radio equipment?

  1. A First Class Radiotelegraph Certificate
  2. A Marine Radio Operator Permit with a radar endorsement
  3. A GMDSS Radio Operator License
  4. A Restricted Radiotelephone Operator Permit Correct answer.

Explanation

A Restricted Radiotelephone Operator Permit authorizes a person to operate radiotelephone equipment aboard voluntarily equipped vessels. The higher-level permits and GMDSS licenses apply to vessels that are required to carry radio equipment.

Question 29FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

The radiotelephone signal 'MAYDAY' indicates that a station is:

  1. in grave and imminent danger and requires immediate assistance. Correct answer.
  2. testing an emergency transmitter.
  3. requesting a routine radio check.
  4. broadcasting a navigational warning.

Explanation

MAYDAY is the international distress signal and is spoken three times to announce that a vessel or person is threatened by grave and imminent danger. It takes precedence over all other transmissions and calls for immediate assistance.

Question 30FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

Call signs assigned by the FCC to United States ship stations begin with which letters?

  1. W or K Correct answer.
  2. V or Z
  3. G or M
  4. P or Q

Explanation

The international series allocated to the United States includes the prefixes K and W, along with N and the block AAA through ALZ. Ship station call signs issued by the FCC are drawn from that United States series.

Question 31FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

Which frequency range is allocated internationally to the maritime mobile service for VHF radiotelephony?

  1. 108 to 137 MHz
  2. 225 to 400 MHz
  3. 156 to 162 MHz Correct answer.
  4. 30 to 88 MHz

Explanation

The maritime mobile VHF band extends from 156 to 162 MHz, and the familiar marine channels are spaced within that band. The other ranges listed serve aeronautical, military and land mobile uses.

Question 32FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

The radiotelephone signal 'SÉCURITÉ' is used to announce:

  1. a distress alert requiring immediate assistance.
  2. the resumption of normal working after distress traffic.
  3. an important navigation or weather safety message. Correct answer.
  4. a request for a radio check.

Explanation

SÉCURITÉ is the safety signal, repeated three times, and it introduces a message concerning the safety of navigation or an important meteorological warning. Distress is announced with MAYDAY and urgency with PAN-PAN.

Question 33FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

In the United States, VHF Channel 13 (156.650 MHz) is designated primarily for:

  1. public correspondence through marine operators.
  2. bridge-to-bridge navigational communications between ships. Correct answer.
  3. distress and safety calling.
  4. onboard communications between a ship and its tenders.

Explanation

Channel 13 is the bridge-to-bridge frequency used for navigational coordination between vessels, and its use is limited to one watt. It is not intended for routine, commercial or public correspondence.

Question 34FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

Which VHF channel is designated for liaison with the U.S. Coast Guard and for reception of its maritime safety information broadcasts?

  1. Channel 66A
  2. Channel 5A
  3. Channel 6
  4. Channel 22A Correct answer.

Explanation

Channel 22A (157.100 MHz) is the Coast Guard liaison and broadcast channel in the United States. It is used for both routine liaison and special notices to mariners.

Question 35FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

For a United States vessel that holds an FCC ship station license, the nine-digit Maritime Mobile Service Identity (MMSI) is assigned by:

  1. the National Oceanic and Atmospheric Administration.
  2. the Federal Communications Commission. Correct answer.
  3. the International Maritime Organization.
  4. the U.S. Coast Guard.

Explanation

The FCC assigns the MMSI as part of the ship station licensing process, and the number is tied to the vessel's station record. NOAA registers EPIRBs, which is a separate function, and the IMO does not assign station identities.

Question 36FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

Which international convention requires most commercial ships on international voyages to carry GMDSS radio equipment?

  1. The Universal Postal Convention
  2. The International Convention on Load Lines
  3. The Convention on the International Regulations for Preventing Collisions at Sea
  4. The International Convention for the Safety of Life at Sea Correct answer.

Explanation

SOLAS, as amended, contains the carriage requirements that oblige ships on international voyages to be fitted with GMDSS equipment. The ITU Radio Regulations govern how the associated frequencies are used but do not set the carriage requirement.

Question 37FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

Under the FCC rules, a vessel in distress may attract attention and obtain assistance by which means?

  1. Only after notifying the nearest coast station in advance
  2. Only the frequencies listed on its ship station license
  3. Only VHF Channel 16 and the 2182 kHz frequency
  4. Any means available, including frequencies not authorized for its station Correct answer.

Explanation

The rules recognize that a station in distress may use any means at its disposal to attract attention, including transmissions on frequencies not authorized in its license. This latitude exists only in genuine distress situations.

Question 38FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

A licensed operator knowingly allows an unlicensed person to transmit using the operator's station. Under FCC rules, the licensed operator:

  1. bears no responsibility for the other person's transmissions.
  2. must surrender the license within 24 hours.
  3. is liable only if interference is caused to another station.
  4. is responsible for the station's proper operation. Correct answer.

Explanation

The person responsible for the station must ensure that all transmissions meet the rules, so permitting unlicensed operation is a violation attributable to that operator. Sanctions can include forfeitures or loss of operating authority.

Question 39FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

An FCC commercial operator license, such as the Marine Radio Operator Permit, is issued for what term?

  1. Ten years, renewable on application
  2. Two years, non-renewable
  3. Five years, renewable on application
  4. The lifetime of the holder Correct answer.

Explanation

Operator licenses granted to individuals remain valid for the lifetime of the holder and do not require periodic renewal. The ten-year renewal cycle applies to station licenses such as the ship station license.

Question 40FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

In the international Table of Frequency Allocations, the maritime mobile service is defined as a mobile service:

  1. between ships and land-based public telephone subscribers only
  2. between ship earth stations and satellites
  3. between aircraft and ships for search and rescue
  4. between coast stations and ship stations, or between ship stations Correct answer.

Explanation

The maritime mobile service covers radiocommunication between coast stations and ship stations, between ship stations, and between ship stations and associated on-board stations. Aircraft and satellite links fall under separate service definitions.

Question 41FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

Which FCC license is required for a person to perform at-sea maintenance of GMDSS equipment aboard a vessel subject to the GMDSS carriage requirements?

  1. Restricted Radiotelephone Operator Permit
  2. General Radiotelephone Operator License
  3. Marine Radio Operator Permit
  4. GMDSS Radio Maintainer License Correct answer.

Explanation

The FCC issues the GMDSS Radio Maintainer License to persons qualified to maintain GMDSS equipment at sea. An operator license authorizes use of the equipment but does not by itself authorize at-sea maintenance.

Question 42FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

Which frequency is the international radiotelephone distress and calling frequency in the 4 MHz band?

  1. 4146 kHz
  2. 4351 kHz
  3. 4417 kHz
  4. 4125 kHz Correct answer.

Explanation

4125 kHz is the carrier frequency used for radiotelephone distress, urgency, safety and calling in the 4 MHz band. It is paired with 8291 kHz in the 8 MHz band for the same purpose.

Question 43FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

The frequency 2187.5 kHz is used in the maritime service for what purpose?

  1. Digital selective calling distress alerts in the medium-frequency band Correct answer.
  2. Navigational telex (NAVTEX) broadcasts
  3. Radiotelephone distress and calling in the medium-frequency band
  4. Ship-to-ship radiotelephony in the 2 MHz band

Explanation

2187.5 kHz carries digital selective calling distress and safety alerts in the medium-frequency band. Voice distress and calling in that band is conducted on 2182 kHz.

Question 44FCC rules and regulations: licensing, operator responsibilities, frequency allocations, and international agreements

A U.S.-licensed ship station operates in the territorial waters of a foreign country. With respect to radio operation, the station must:

  1. obtain a new ship station license from the host country.
  2. suspend all transmissions until it returns to international waters.
  3. follow only the regulations of the United States.
  4. observe both its own license conditions and the host country's rules. Correct answer.

Explanation

Under the international Radio Regulations, a ship station remains subject to the administration of the flag state but must also comply with the regulations in force in the waters it is visiting. This dual obligation prevents conflict with local radio rules.

Question 45Radio operating procedures and practices, including distress, urgency, and safety communications

Which radiotelephone signal indicates that a vessel is in distress and requires immediate assistance?

  1. MAYDAY Correct answer.
  2. SILENCE MAYDAY
  3. PAN PAN
  4. SECURITE

Explanation

MAYDAY is the international radiotelephone distress signal and has absolute priority over all other communications. It is used only when a vessel or person is in grave and imminent danger and immediate assistance is required.

Question 46Radio operating procedures and practices, including distress, urgency, and safety communications

A vessel has a serious medical emergency on board but is not in immediate danger of sinking or loss. Which signal should introduce its radiotelephone call?

  1. MAYDAY
  2. PAN PAN Correct answer.
  3. SECURITE
  4. MAYDAY RELAY

Explanation

The urgency signal PAN PAN is used when a vessel has a serious problem but is not in grave and imminent danger. A medical emergency that requires urgent advice or assistance but not immediate rescue is a typical urgency case.

Question 47Radio operating procedures and practices, including distress, urgency, and safety communications

Which signal introduces a radiotelephone message containing a navigational or meteorological safety warning?

  1. PAN PAN
  2. SECURITE Correct answer.
  3. SILENCE FINI
  4. MAYDAY

Explanation

SECURITE is the safety signal and is spoken three times at the start of a safety message. It is used for important navigational or meteorological warnings that affect the safety of navigation.

Question 48Radio operating procedures and practices, including distress, urgency, and safety communications

Which VHF channel is used for radiotelephone distress, safety, and calling?

  1. Channel 16 Correct answer.
  2. Channel 6
  3. Channel 70
  4. Channel 13

Explanation

VHF Channel 16 is the radiotelephone distress, safety, and calling channel. Initial calls are made on Channel 16 and working traffic is then moved to a suitable working channel.

Question 49Radio operating procedures and practices, including distress, urgency, and safety communications

Which frequency is the MF radiotelephone distress and calling frequency?

  1. 8291 kHz
  2. 2182 kHz Correct answer.
  3. 2638 kHz
  4. 4125 kHz

Explanation

2182 kHz is the MF radiotelephone distress and calling frequency. Distress, urgency, and safety traffic on MF radiotelephony is conducted on or initiated on this frequency.

Question 50Radio operating procedures and practices, including distress, urgency, and safety communications

What is the primary function of a 406 MHz EPIRB?

  1. To measure water depth at the vessel
  2. To provide a radar echo for search vessels
  3. To carry voice traffic on VHF Channel 16
  4. To alert search and rescue by satellite Correct answer.

Explanation

A 406 MHz EPIRB transmits an alert that is detected by satellite and passed to search and rescue authorities. It also provides identification and, in many models, position information to help locate the vessel.