What is the fundamental concept of the GMDSS?
A. GMDSS utilizes automated systems and satellite technology to improve emergency communications for the world’s shipping industry.
B. It is intended to automate and improve existing digital selective calling procedures and techniques.
C. It is intended to provide more effective but lower cost commercial communications.
D. It is intended to provide compulsory vessels with a collision avoidance system when they are operating in waters that are also occupied by non-compulsory vessels.
The primary purpose of the GMDSS is:
A. Allow more effective control of SAR situations by vessels.
B. Automate and improve emergency communications for the world's shipping industry.
C. Provide additional shipboard systems for more effective company communications.
D. Effective and inexpensive communications.
Which of the following regions lie outside Sea Areas A1, A2, and A3?
A. Sea Areas only apply to Inmarsat footprint areas.
B. Sea Area A3-I Inmarsat coverage and Sea Area A3-S HF SITOR (NBDP) coverage.
C. Sea Area A4
D. There are no additional Sea Areas.
Which of the following is a functional or carriage requirement for compulsory vessels?
A. A compulsory vessel must carry at least two (2) FCC licensed GMDSS Radio Operators in all sea areas as well as a GMDSS Maintainer in sea areas A3 & A4.
B. A compulsory vessel must satisfy certain equipment carriage requirements based on the intended sea area of operation.
C. A compulsory vessel must be able to transmit and respond to Distress alerts and carry only one (1) FCC licensed GMDSS Radio Operator in sea areas A1 & A2.
D. None of these answers are correct.
Which GMDSS communication functions must all compulsory vessels be capable of performing to meet International Maritime Organization requirements?
A. Distress alerting and receipt of Maritime Safety Information via Inmarsat for all vessels intending to operate in Sea Area A4.
B. Distress alerting and receipt of MSI in Sea Areas A1, A2, A3, and A4 regardless of the vessel's intended area of operation.
C. Distress alerting, general communications and receipt of Maritime Safety Information in the vessel's intended area of operation.
D. General communications via Inmarsat and receipt of Maritime Safety Information via Enhanced Group Calling in Sea Area A4.
Which statement is true regarding a vessel equipped with GMDSS equipment that will remain in Sea Area A1 at all times?
A. The vessel must be provided with a radio installation capable of initiating the transmission of ship-to-shore Distress alerting from the position from which the ship is normally navigated.
B. VHF DSC alerting may be the sole means of Distress alerting.
C. HF or MF DSC may satisfy the equipment requirement.
D. HF SSB with 2182 kHz automatic alarm generator may satisfy the equipment requirement.
What statement is true regarding the additional equipment carriage requirement imposed for the survival craft of vessels over 500 gross tons?
A. Additional carriage of two radio equipped lifeboats aft.
B. A second radar transponder is required.
C. Four additional portable VHF radios are required.
D. The ability to communicate in all modes with any shore station.
Which of the following statements concerning maintenance requirements is false?
A. Compulsory vessels sailing in Sea Areas A1 and A2 must provide any one of the three maintenance options which are duplication of equipment, shore-based, or at-sea maintenance capability.
B. Compulsory vessels sailing in Sea Areas A3 and A4 must provide any two of the three maintenance options which are duplication of equipment, shore-based, or at-sea maintenance capability.
C. Equipment warranties do not satisfy GMDSS maintenance requirements.
D. If shore-based maintenance is used, maintenance services do not have to be completed or performance verified unless the vessel will be sailing to a non-US port.
What statement best describes modulation?
A. Imposing intelligence onto a radio carrier signal.
B. Changing mark-space to 1 and 0.
C. Adjusting the frequency to the optimum band for long distance communications.
D. Converting the carrier from a low frequency to a higher frequency.
What statement best describes demodulation?
A. Detuning the receiver to remove interfering signals.
B. Extracting intelligence from the radio carrier signal.
C. Removing atmospheric noise from the signal.
D. Separating the TELEX signals from the voice signals.
Which of the following statements describes the carrier?
A. The carrier consists of at least 3 separate but closely spaced frequencies.
B. The carrier is used to modulate the information signal.
C. There are always sidebands on either side of the carrier.
D. The carrier is a Radio Frequency (RF) signal that is modulated to carry intelligence.
How often must a compulsory vessel's GMDSS radio station be inspected?
A. Annually, by the FCC or designated authority.
B. Annually, by the U.S. Coast Guard.
C. Annually, by the FCC, and every six months if the vessel sails outside of Sea Areas A1 and A2.
D. The FCC's annual inspection may be waived if and only if monthly inspections are performed by the vessel's on-board GMDSS Radio Maintainer.
Which of the following references should be consulted for information on the proper setup and use of GMDSS equipment?
A. ITU List of Equipment Operations.
B. 47 CFR Part 80 Subpart W.
C. Instructions are available through the Maritime Safety Information (MSI) system.
D. The manufacturer's operating manuals.
Which of the following maintenance functions is not the responsibility of the GMDSS Radio Operator?
A. Visual inspection of equipment, including the antenna and associated components.
B. Perform on-the-air verification checks.
C. Aligning the power output stage for maximum power.
D. Perform scheduled testing of the battery's charged condition.
When may a compulsory vessel not be allowed to leave port?
A. When the vessel is in an over-carriage condition.
B. When the vessel has arranged for both duplication of equipment and shore-based maintenance.
C. When the vessel is carrying only two licensed GMDSS Radio Operators and is capable of performing all required functions.
D. When the vessel has replaced a required piece of GMDSS-related equipment but its performance has not been verified or logged.
Which FCC license meets the requirement to serve as a GMDSS operator?
A. General Radiotelephone Operator’s License.
B. GMDSS Radio Operator’s License.
C. Marine Radio Operator’s Permit.
D. GMDSS Radio Maintainer’s License.
Which statement is false regarding the GMDSS requirement for ship sources of energy?
A. The reserve sources of energy need to supply independent MF and HF radio installations at the same time.
B. At all times while the vessel is at sea, a sufficient supply of electrical energy to operate the radio installations and charge any batteries which may be part of the reserve source of energy is required.
C. An uninterruptible power supply or other means of ensuring a continuous supply of electrical power to all GMDSS equipment that could be affected by normal variations and interruptions of ship's power is required.
D. If a vessel’s position is constantly required for the proper performance of a GMDSS station, provisions must be made to ensure position information is uninterrupted if the ship’s source of main or emergency energy fails.
A vessel certified for service in Sea Area A3 is required to maintain a watch on:
A. VHF Channel 70, MF Frequency 2182.0 kHz, HF on 8414.5 kHz and one other HF DSC frequency.
B. MF Frequency 2187.5 kHz, HF on 8414.5 kHz and one other HF DSC frequency, HF on 4125.0 kHz.
C. VHF Channel 70, MF Frequency 2187.5 kHz, HF on 8414.5 kHz and one other HF DSC frequency.
D. VHF Channel 16, VHF Channel 70, MF Frequency 2187.5 kHz, HF on 8414.5 MHz and HF 4177.5 MHz.
Which of the following statements meets requirements for 47 CFR 80 Subpart-W?
A. GMDSS Radio Logs may not be retained aboard compulsory vessels in an electronic file (e.g., word processing) format.
B. GMDSS Radio Logs must contain entries of all Distress and Urgency communications affecting your own ship.
C. GMDSS Radio Logs must be retained aboard compulsory vessels for a period of at least 90 days in their original form.
D. Entries in the GMDSS Radio Log are only required for communications within the vessel's intended Sea Area of operation.
What sequence best describes an MF-HF DSC Distress menu transmission?
A. Vessel name, Distress priority code, vessel position & time, nature of Distress,
B. A string of dots to stop the DSC scanner, vessel MMSI, vessel position & time, nature of Distress, frequency for follow-on communications.
C. Vessel MMSI, frequency & emission for follow-on communications, vessel position & time, Distress priority code.
D. A string of dots to stop the DSC scanner, Distress priority code, vessel position & time, emission for follow-on communications, DSC frequency.
MF-HF DSC alerts are transmitted using what emission type?
A. J2B to ensure compatibility with DSC receivers.
B. J3E to ensure correct voice follow-on frequencies are used.
C. F1B to ensure correct SITOR (NBDP) follow-on frequencies are used.
D. A3E to achieve the best transmission range.
Which of the following statements concerning DSC equipment is true?
A. The GMDSS Radio Operator is not responsible for properly selecting HF DSC guard channels because they are done automatically by the watch receiver.
B. All equipment must be type accepted by Inmarsat.
C. The vessel's navigational position must be updated, either automatically or manually, no less often than every four (4) hours.
D. The GMDSS Radio Operator is responsible for properly selecting VHF & MF DSC guard channels but the HF frequencies are done automatically by the watch receiver.
What is usually the first step for a GMDSS Radio Operator to take when initiating a Distress priority message via Inmarsat?
A. By pressing a "Distress Button" or "Distress Hot Key(s)" on the equipment.
B. By dialing the correct code on the telephone remote unit.
C. By contacting the LES operator and announcing a Distress condition is in existence.
D. By contacting the LES operator using the radiotelephone Distress procedure "Mayday"... etc.
Which statement is true regarding the receipt and acknowledgement of actual Distress follow-on communications by GMDSS ship stations?
A. Ship stations in receipt of Distress alert should not defer acknowledgement for a short interval, so that receipt may be acknowledged by the coast station.
B. A Coast station has the sole obligation to respond. A ship station should wait for the Coast station MMSI DSC Acknowledgment before taking action. If a Coast station has no response in 15 minutes the ship should DSC acknowledge and inform the RCC.
C. A ship station that receives a Distress call from another vessel must, as soon as possible, inform the Master or person responsible for the ship of the contents of the Distress communications received.
D. Alerts concerning navigational hazards are second only to Safety traffic.
Your ship received a Distress relay from a coast station on DSC freq. 2187.5 kHz. What action should the watch officer take?
A. Retransmit the DSC call on 2187.5 kHz to other vessels in the vicinity to assist in SAR operations.
B. Monitor 2182.0 kHz to determine if there are any genuine Distress communications.
C. Transmit a voice “Mayday Relay” call on 2187.5 kHz to other vessels in the vicinity.
D. Transmit a voice “Mayday Relay” call on 2182.0 kHz to other vessels in the vicinity.
What action should you take after sending a false Distress alert on VHF?
A. Make a voice announcement to cancel the alert on Ch-16.
B. Send a DSC cancellation message on Ch-70.
C. Make a voice announcement to cancel the alert on Ch-13.
D. Make a voice announcement to cancel the alert on Ch-22A.
What is the fundamental purpose for imposing radio silence?
A. To ensure that interference to proprietary communications is minimized.
B. To ensure that only voice communications can be effected on the Distress frequency or channel.
C. To ensure that a Distressed vessel will have a "window" twice each hour for transmitting routine messages.
D. To mitigate the risk of interference on a frequency or channel being used for emergency communications.
When the GMDSS Radio Operator on watch hears "Securite" spoken three times, he can expect to receive the following information:
A. The safety of vessel or person is in jeopardy.
B. A message concerning the Safety of navigation.
C. A vessel is in need of immediate assistance.
D. A Coast Station sending an important traffic list.
Which of the following frequencies and modes is allocated for Distress alerting in GMDSS?
A. 406 MHz via EPIRB, 1626.5-1645.5 MHz via Inmarsat and Channel 70 DSC plus six (6) MF/HF DSC frequencies.
B. 1626.5-1645.5 MHz via Inmarsat, VHF CH-16 plus six (6) MF/HF DSC frequencies, 406 MHz via EPIRB.
C. Channel 70 DSC plus six (6) MF/HF DSC frequencies, 7 voice follow-on and 6 telex follow-on frequencies.
D. Mayday on VHF Channel 70 and the other six voice follow-on frequencies.
Which of the following steps should be taken, if possible, when the vessel must be abandoned because of a Distress situation?
A. Alert the U.S. Coast Guard by using the survival craft's portable Inmarsat unit.
B. Program the SART and EPIRB to transmit the vessel's location and situation.
C. No additional steps are needed as the SART and EPIRB will both automatically float free and operate properly.
D. Secure the EPIRB to the survival craft and mount the SART in a position to maximize its elevation.
What indication is given to the personnel in a survival craft of the approach of SAR craft?
A. The Satellite EPIRB will change its strobe light pattern to indicate radar interrogation.
B. The SART informs survivors when the SART switches to the "standby" mode.
C. The SART may provide a visual or audible indication of interrogation by a 3-cm radar.
D. The AIS SART will alarm to indicate that SAR craft with radars are getting close.
How does the searching vessel's radar interrogate a survival craft SART?
A. Activate the IFF interrogation system.
B. The SART responds automatically and transmits the 12-blip signal when it detects the search craft or other vessels' X-Band radar signal.
C. Maintains watch on VHF-FM Ch-70 for the SART's unique identifier.
D. The SART responds automatically when it detects the search craft or other vessel's 10-cm radar signal.
Which of the following statements concerning testing and maintenance of SARTs is true?
A. Testing a SART should be done in a consistent manner & location to ensure a baseline history of proper results.
B. Testing of the SART should never be done in port to prevent interference to other vessel’s radars.
C. A SART's battery must be replaced within ninety (90) days after the expiration date imprinted on the unit.
D. An at-sea GMDSS maintainer is not able to test a SART because it is hermetically sealed.
Which is not a function of a satellite under COSPAS-SARSAT using satellite EPIRBs?
A. Relayed satellite message includes the EPIRB ID number which provides a reference for retrieval of vessel information from the shore database.
B. Doppler shift of EPIRB signal is measured and the EPIRB’s position is calculated.
C. Information received from EPIRBs is time-tagged and transmitted to any Local User Terminal in the satellite's view.
D. After the EPIRB’s position is calculated using the Doppler shift COSPAS-SARSAT satellites provide follow-on SAR communications.
What features may be found on GMDSS satellite EPIRB units?
A. Strobe light, Distress homing transmission on 406 MHz, float-free release bracket.
B. Emergency transmission on 406 MHz, hydrostatic release, AIS homing frequency.
C. Float-free release bracket, strobe light & Distress alert transmission on 406 MHz.
D. Hydrostatic release, Distress alert transmission on 121.5 MHz, strobe light.
With what other stations may portable survival craft transceivers not communicate?
A. Communication between the ship and survival craft transceivers ashore.
B. Communication between the ship and its survival craft.
C. Communication between rescue units and survival craft.
D. Communication between multiple survival craft and with aircraft.
Which action should the GMDSS radio operator take in a Distress situation when embarking in survival craft?
A. EPIRB and SART switched on manually prior to embarking; remain aboard vessel in Distress.
B. Notify RCC (Rescue Coordination Center) through VHF DSC in portable equipment.
C. Switch on EPIRB and SART immediately and leave on.
D. Communicate via Inmarsat-C from the survival craft.
What actions should the GMDSS radio operator take prior to any potential Distress situation?
A. Create a table or chart of all the DSC coast stations that might be used during the vessel’s itinerary.
B. All of these answers are good operational practice and should be consistently done.
C. Prepare a detailed Distress message file on both satellite & MF-HF SITOR (NBDP) equipment containing all information needed in a Distress so it will be available for last-minute editing.
D. Ensure all LES choices are correct and then updated properly as the vessel transits different SAR jurisdictions.
Which of the following control selections may result in limited receiving range?
A. Setting the squelch control to its maximum level.
B. Setting the squelch control to its minimum level.
C. The power switch is set to the "high" output position, resulting in receiver overloading.
D. Setting the channel selection switch midway between channels 6 and 16.
A VHF frequency channel pair of TX 157.200 MHz and RX 161.800 MHz would most likely be:
A. A VTS frequency for VTS – Ship communications.
B. A simplex Public Correspondence Coast Radio Station frequency.
C. A simplex Private Coast Radio Station frequency.
D. A duplex Public Correspondence Coast Radio Station frequency.
How is mutual interference on 518 kHz among NAVTEX stations avoided?
A. All stations transmit at the same time but stations are limited to daytime operation only to reduce the radius of propagation.
B. Transmitter power is limited, station assignment codes are not shared by other NAVAREAS and stations alternate between daytime and nighttime operations.
C. Transmissions scheduled on a time-sharing basis, power limited and station assignment codes are geographically separated.
D. Station codes are not shared by other NAVAREAS, transmissions scheduled on a time-sharing basis and power is limited.
How is a NAVTEX receiver programmed to reject certain messages?
A. The transmitting station's two-digit identification can be entered to de-select reception of its broadcasts.
B. By choosing a message category's single letter (A-Z) identifier and then deselecting or deactivating.
C. By entering the SELCAL of the NAVTEX transmitting station.
D. By pressing "00" in the transmitter's ID block.
The NAVTEX message header contains the following?
A. The first letter (from A to Z) indicates the NAVTEX transmitting station.
B. A two-digit number (01-99) indicates the NAVTEX message category.
C. Message numbers include a date/time group, along with the transmitting station's numerical ID.
D. None of these answers is correct.
If the Inmarsat-C terminal is inoperative but the vessel remains within NAVTEX coverage -- which of the following message categories should not be disabled by the GMDSS Radio Operator?
A. Navigational warnings, meteorological warnings and metrological forecasts.
B. Meteorological warnings, Search and Rescue information and Navigational warnings.
C. Search and Rescue information, navigational warnings and other electronic navaid messages.
D. Search and Rescue information, Meteorological warnings and ice reports.
Which action must be taken to ensure that incoming message traffic of all priority levels will be received through Inmarsat-C?
A. The GMDSS Radio Operator must log-in to the desired satellite (if the unit did not automatically do so.)
B. No additional action is necessary after turning on the receiver and aiming the antenna at the desired satellite.
C. The system needs only to be commissioned and turned on.
D. The GMDSS Radio Operator must log-in to the desired satellite and receive the message reference number (MRN) from the LES.
What is the primary function of an NCS?
A. To provide direct communications between the Inmarsat station placing a call and the station receiving the call.
B. To provide multi-mode communications between the Inmarsat station placing a call and the coast radio station that will deliver it.
C. To determine which satellite is best suited to provide communications between the Inmarsat station placing a call and the station receiving the call.
D. To monitor and control communications through the Inmarsat satellite for which it is responsible.
How is a signal radiated from an Inmarsat-B or F77 system's antenna?
A. It is usually radiated in an omni-directional pattern, but an optional feature allows it to be directional for use when the vessel is on the fringe of the satellite's footprint.
B. It is a highly focused directional signal that must be beamed at the desired satellite.
C. It is radiated in an omni-directional pattern.
D. It is radiated in an omni-directional pattern that can be reversed by the Operator to attain directional beaming to an alternate satellite.
Which of the following best describes Inmarsat-C operation?
A. Is an analog-based system.
B. Requires a stabilized directional antenna.
C. Provides for voice, TELEX, high and low-speed data and compressed video communications.
D. Is a digital store-and-forward system that also provides Enhanced Group Call, data reporting, polling and Distress alerting capabilities.
Which Inmarsat Earth stations would be available for Inmarsat-C traffic if the vessel is off the Pacific Coast of the United States but logged-in to the AOR-W satellite?
A. EIK (Norway), Tangua (Brazil), Thermopylae (Greece)
B. Southbury (USA), Burum (Netherlands), or EIK (Norway).
C. Santa Paula (USA), Psary (Poland), Yamaguchi (Japan).
D. Beijing (PRC), Fucino (Italy), Nudol (Russia).
A vessel is tracking the AOR-W satellite. To initiate an automatic ship-to-shore telephone contact to a shoreside party in the U.S. phone # 123-456-7890, via Southbury Earth Station, a valid Inmarsat operations/dialing sequence is?
A. Select LES 001# then dial 0011234567890#
B. Select LES #002 then dial 11234567890#
C. Select LES 104# then dial 11234567890+
D. Select LES 001+ then dial 123 4567890#
From an Inmarsat-C terminal, which of the following are correctly formatted address for sending TELEX messages to two vessels in the AOR-W? First to an Inmarsat-B and second to an Inmarsat-C.
A. 870366719020 first and 870436671929 second.
B. 584436671929 first and 584366719020 second.
C. 584366719020 first and 584436671929 second.
D. 58136671920 first and 58136671929 second.
Which of the following are correctly formatted Inmarsat-C address book entries for sending communications to two fax machines on vessels in the AOR-W? First is an F77 terminal and second an Inmarsat-B terminal.
A. 870768790319 and then 870334600340
B. 8704336837925 and then 870452998777
C. 584768790319 and then 584334600340
D. 1 870 768790319 and then 1 870 334600340
How may an Inmarsat-C unit be used to send text communications to an Internet destination?
A. Call up the file menu, insert the internet address in the first line of the file and use the SEND/REC or TRANSMIT menu to send the message.
B. Use the SEND/REC or TRANSMIT menu, compose a text file and use the file attach function in the file menu.
C. Internet addresses cannot be reached from an Inmarsat-C terminal without a separate e-mail computer.
D. Compose a text file, use the SEND/REC or TRANSMIT menu & specify the recipient using the address book function (or by manual entry) for e-mail.
What action would be the swiftest and most certain way to notify a RCC of a Distress situation aboard your vessel?
A. Compose a detailed Distress message and send it to the closest LES to optimize the SAR response.
B. Confirm the information in the Distress Alert Message setup menu is correct and use the “hot-key” or Distress Message Generator function on your satellite terminal.
C. Press all of the “hot keys” available in the GMDSS console to ensure the RCC is notified.
D. Send a multi-frequency DSC alert to ensure the RCC is notified regardless of Ionospheric propagation conditions.
Upon receipt of SafetyNETTM messages of the Distress or Urgency category on the ship's EGC receiver, what action is required by the GMDSS Radio Operator?
A. Manually reset the alarm.
B. No immediate action is required as an audible tone will be generated at the beginning and end of the transmission and a paper printout of the message will be generated.
C. No immediate action is required by the operator since the transmission will be automatically acknowledged by the receiving vessel.
D. A periodic alarm tone will be heard until the radio operator prints the message from the unit's memory.
What immediate remedy can be used to correct shadowing of the satellite signal by a shipboard obstruction?
A. Relocate the mast or other obstruction.
B. Raise the transmit power level.
C. Change the ship's course.
D. Increase the receiver gain.
How are paired SITOR (NBDP) frequencies normally used?
A. These are normally used for ARQ communications with coast radio stations.
B. These are normally used for FEC communications with coast radio stations.
C. These are normally used only for Distress communications to limit channel interference.
D. These are normally used for DSC communications with coast radio stations.
Which statement regarding bandwidth and channel spacing is correct:
A. Bandwidth values are a function of channel spacing values.
B. Channel spacing values are not a function of bandwidth values.
C. Channel spacing values are a function of bandwidth values.
D. Bandwidth & channel values do not vary with emission mode.
For RF communications, "modulation" is best defined as:
A. Using a single carrier frequency with the proper power level.
B. The combination of information or intelligence on to a radio carrier frequency.
C. Setting up the transceiver with the correct bandwidth to ensure proper communications.
D. The combination of the received frequency and oscillator frequency in the mixer.
Which of these is not a primary purpose of the MF/HF DSC controller?
A. It provides for the electronic memory of incoming and outgoing DSC calls.
B. It permits control of transceiver operations in response to an incoming DSC call.
C. It provides for the formatting and transmission of outgoing DSC calls.
D. It provides the scanning watch receiver capability on the 6 MF/HF DSC frequencies.
What is meant by describing a Coast Station with the acronym ATOR?
A. The station’s BFEC operations are computerized and a rigid operating sequence must be followed correctly.
B. The station will control all of the ARQ operations and it will generate the proper service request codes at the correct time in the sequence.
C. The station’s ARQ operations are computerized and a rigid operating sequence must be followed correctly.
D. The station will control all of the ARQ operations and it will provide prompts for the operator to request time & charges at the correct time in the sequence.
Which of the following statements concerning SITOR (NBDP) communications is true?
A. ARQ transmissions are acknowledged by the Information Receiving Station only at the end of the message.
B. ARQ transmissions are made in data groups consisting of three-character blocks.
C. ARQ communications rely upon error correction by time diversity transmission and reception.
D. Forward error correction is an interactive mode.
Which of the following events will take place immediately after phasing with a Coast Station on an available channel?
A. The ship station begins transmitting the text to the destination telex terminal.
B. The vessel will request the shore station's answerback to confirm it has reached the correct station.
C. The ship will transmit the desired command (such as DIRTLX+, OBS+ or AMV+) to the coast radio station.
D. After exchanging answer-backs (WRU/AAB) the coast station transmits GA+? and awaits a command.
Which of the following statements concerning SITOR (NBDP) communications is true?
A. Communication is established on the working channel and answerbacks are exchanged before FEC broadcasts can be received.
B. All of these answers are true.
C. Weather broadcasts cannot be made in FEC because sending each character twice would cause the broadcast to be prohibitively long.
D. Two-way communication with the coast radio station using FEC is not necessary to be able to receive the broadcasts.
The "short rules" of propagation necessary to select the appropriate frequency band are:
A. Shorter distance = Higher Frequency, Daytime = Higher Frequency.
B. Shorter distance = Lower Frequency, Daytime = Higher Frequency.
C. Shorter distance = Higher Frequency, Daytime = Lower Frequency.
D. Shorter distance = Lower Frequency, Daytime = Lower Frequency.
Which of the following conditions would be a symptom of malfunction in a 2182 kHz radiotelephone system which must be reported to the Master?
A. Much lower noise level observed during daytime operation.
B. No indication of power output when speaking into the microphone.
C. When testing a radiotelephone alarm on 2182 kHz into an artificial antenna, the Distress frequency watch receiver becomes unmuted, an improper testing procedure.
D. Failure to contact a shore station 600 nautical miles distant during daytime operation.