JRC JHS-800S User manual

MARINE VHF RADIOTELEPHONE
Instruction Manual
7ZPJD0714

.

Safety Precautions
Radio and radar devices are operated by high voltages of anywhere from a few hundred
volts up to many hundreds of thousands of volts.
Observe the following precautions to prevent the risk of electric shock.
Avoid contact with the internal parts of these devices.
Only specialized service people should do any maintenance, inspections, or adjustments
inside the devices.
Falling after receiving an electric shock may lead to extensive secondary injuries, so be sure
you have a safe place to stand when working.
In the event that someone receives an electric shock, immediately implement emergency
procedures, such as cardiopulmonary resuscitation.
If you must reach into a device, as in the case of an emergency, you must switch off the
devices and ground a terminal in order to discharge the capacitors. After making certain that
all the electricity is discharged, only then can you insert your hand into the device. Wearing
dry cotton work gloves is another way to reduce risks. One more necessary precaution is to
not use both hands at the same time.
Although there is no danger with normal use, it is very dangerous if contact is made
accidently with the internal parts of these devices. There is a very high risk of death by high
voltages of tens of thousands of volts. In some cases, you could be fatally electrocuted by
voltages of several hundred volts.
If you find an electrocution victim, you must first switch off the machinery that caused the
electrocution and ground all circuits.
If you are unable to immediately cut off the circuit, do not directly touch the victim. Quickly
use a non-conductive material, such as a dry board or cloth, to move the victim away from
the device.
If someone receives an electric shock, immediately implement emergency procedures, such
as cardiopulmonary resuscitation.
When a person is electrocuted, the current passes through their heart and may cause
ventricular fibrillation or cardiac arrest. Also, if the shock is mild, the victim's breathing may
be restored by doing artificial respiration. An electrocution victim becomes very pale, their
pulse can be very weak or even stop, and they may lose consciousness and become stiff.
CAUTIONS AGAINST HIGH VOLTAGE
Precautions for rescuing victims from electrocution

☆Note points for first aid
Unless there is impending danger, leave the electrocution victim where he or she is, then
begin artificial respiration. Once you begin artificial respiration, you must continue without
losing rhythm.
(1) Make contact with the victim cautiously, there is a risk that you may get electrocuted.
(2) Switch off the machinery and then move the victim away slowly if you must.
(3) Inform someone immediately (a hospital or doctor, dial emergency numbers, etc.).
(4) Lay the victim on his or her back and loosen any constrictive clothing (a tie, or belt).
(5) (a) Check the victim's pulse.
(b) Check for a heartbeat by pressing your ear against the victim's chest.
(c) Check if the victim is breathing by putting the back of your hand or face near the
victim's face.
(d) Check the pupils of the eyes.
(6) Open the victim's mouth and remove any artificial teeth, cigarette or chewing gum.
Leave the mouth opened and flatten the tongue with a towel or by putting something
into the mouth to prevent the victim's tongue from obstructing the throat. (If he or she
is clenching the teeth and it is difficult to open the mouth, use a spoon or the like to
pry open the mouth.)
(7) Continually wipe the mouth to prevent the accumulation of saliva.
First aid

☆If the victim has a pulse but is not breathing
(“Mouth to mouth” resuscitation) Figure 1
(1) Place the victim’s head facing backward (place something under the neck like a pillow).
(2) Point the chin upward to widen the trachea.
(3) Pinch the victim’s nose, take a deep breath, then put your mouth over the victim’s
mouth and exhale completely, making sure that your mouth completely covers the
victim’s mouth. Then remove your mouth. Repeat this routine 10 to 15 times per
minute (holding the nostrils).
(4) Pay attention to the victim to notice if he or she starts to breath. If breathing returns,
stop resuscitation.
(5) If it is impossible to open the victim’s mouth, put something like a plastic straw or vinyl
tube into one of the nostrils then blow air in while covering the mouth and the other
nostril.
(6) Occasionally, when the victim comes back to consciousness, they immediately try to
stand up. Prevent this and keep them in a laying position. Give them something
warm to drink and be sure that they rest (do not give them any alcohol).
Administering artificial respiration by raising the head.
① (1) Raise the back of head, then place one
hand on the forehead and place the
other hand under the neck. →①
Most victims open their mouth when this
is done, making “mouth to mouth”
resuscitation easier.
② (2) Cover the victim’s mouth by opening
your mouth widely, then push your cheek
against the victim’s nose, →②
or pinch the victim’s nose to prevent air
from leaking out of it. →③
③ (3) Completely exhale into the lungs.
Exhale into the lungs until the chest
inflates.
You have to blow as rapidly as possible
for the first 10 times.
“Mouth to mouth” artificial respiration
Figure 1

Flow of Cardiopulmonary Resuscitation (CPR)
A person
is
collapsin
g.
- Secure the safety of the surrounding area.
- Prevent secondary disasters.
Check for response.
- Call while tapping the shoulder.
Breathing
Recovery position
- Lay the injured or
ill person on
his/her side and
wait for the arrival
of the emergency
services.
Not responding
Ask for help.
- Make an emergency call.
- Ask to bring an AED.
Listen to the appeal of the
injured or ill person and give
the necessary first-aid
treatment.
Responding
Not breathing
Give 2 rescue breaths; omittable Note(1)
Give CPR.
- 30 chest compressions
- Give 2 rescue breaths; omittable Note(1)
Note(1) Omission of rescue breathing:
If there is a fear of infection because the
injured or ill person has an intraoral injury,
you are hesitant about giving mouth-to-
mouth resuscitation, or preparing the
mouthpiece for rescue breathing takes too
long, omit rescue breathing and proceed to
the next step.
Open the airway.
- Check for breathing.
Arrival of an AED
- Turn on the power.
- Use the AED by following its voice prompts.
Fitting of the electrode pads, etc.
Automatic electrocardiogram
analysis
- Do not touch the injured or ill
person.
Electric shock is needed.
Electric shock is not needed.
Delivery of electric shock
Resume CPR from chest
compressions by following the
voice prompts of the AED.
When the injured or ill
person has been
handed over to the
emergency services
or has started
moaning or breathing
normally, lay him/her
on his/her side in a
recovery position and
wait for the arrival of
emergency services.
When to
stop CPR
A person is collapsing.
- Secure the safety of the surrounding area.
- Prevent secondary disasters.
The AED
automatically
analyzes the
heart rhythm
every 2 min.

Are you OK?
Roll gently in the opposite
direction every 30 minutes.
Please call an
ambulance.
Please bring
an AED.
Specific Procedures for Cardiopulmonary Resuscitation (CPR)
1. Check the scene for safety to prevent secondary disasters
a) Do not touch the injured or ill person in panic when an accident has occurred. (Doing so may
cause electric shock to the first-aiders.)
b) Do not panic and be sure to turn off the power. Then, gently move the injured or ill person to a
safe place away from the electrical circuit.
2. Check for responsiveness
a) Tap the shoulder of the injured or ill and shout in the ear saying,
"Are you OK?"
b) If the person opens his/her eyes or there is some response or
gesture, determine it as "responding." But, if there is no response
or gesture, determine it as "not responding."
3. If responding
a) Give first-aid treatment.
4. If not responding
a) Ask for help loudly. Ask somebody to make an emergency call
and bring an AED.
• Somebody has collapsed. Please help.
• Please call an ambulance.
• Please bring an AED.
• If there is nobody to help, call an ambulance yourself.
5. Open the airway
a) Touch the forehead with one hand. Lift the chin with the two fingers
of the middle finger and forefinger of the other hand and push down
on the forehead as you lift the jaw to bring the chin forward to open
the airway. If neck injury is suspected, open the airway by lifting the
lower jaw.
6. Check for breathing
a) After opening the airway, check quickly for breathing for no more than
10 seconds. Put your cheek down by the mouth and nose area of the
injured or ill person, look at his/her chest and abdomen, and check the
following three points.
• Look to see if the chest and abdomen are rising and falling.
• Listen for breathing.
• Feel for breath against your cheek.
b) If the injured or ill person is breathing, place him/her in the recovery
position and wait for the arrival of the emergency services.
• Position the injured or ill person on his/her side, maintain a clear
and open airway by pushing the head backward while positioning
their mouth downward. To maintain proper blood circulation, roll
him/her gently to position them in the recovery position in the
opposite direction every 30 minutes.

Compress
with these
parts (the
heels of both
hands).
30 times
2 times
CPR mask
Mouthpiece for rescue
breathing
7. Give 2 rescue breaths (omittable)
a) If opening the airway does not cause the injured or ill person to begin
to breathe normally, give rescue breaths.
b) If there is a fear of infection because the injured or ill person has an
intraoral injury, you are hesitant about giving mouth-to-mouth
resuscitation, or getting and preparing the mouthpiece for rescue
breathing takes too long, omit rescue breathing and perform chest
compressions.
c) When performing rescue breathing, it is recommended to use a
mouthpiece for rescue breathing and other protective devices to
prevent infections.
d) While maintaining an open airway, pinch the person's nose shut with
your thumb and forefinger of the hand used to push down the
forehead.
e) Open your mouth widely to completely cover the mouth of the injured
or ill person so that no air will escape. Give rescue breathing twice in
about 1 second and check if the chest rises.
8. Cardiopulmonary resuscitation (CPR) (combination of chest compressions and
rescue breaths)
a) Chest compressions
1) Position of chest compressions
• Position the heel of one hand in the center of the chest, approximately between the nipples,
and place your other hand on top of the one that is in position.
2) Perform chest compressions
• Perform uninterrupted chest compressions of
30 at the rate of about 100 times per minute.
While locking your elbows positioning yourself
vertically above your hands.
• With each compression, depress the chest
wall to a depth of approximately 4 to 5 cm.
b) Combination of 30 chest compressions and 2 rescue breaths
1) After performing 30 chest compressions, give 2 rescue
breaths. If rescue breathing is omitted, perform only chest
compressions.
2) Continuously perform the combination of 30 chest
compressions and 2 rescue breaths without interruption.
3) If there are two or more first-aiders, alternate with each other
approximately every two minutes (five cycles of
compressions and ventilations at a ratio of 30:2) without
interruption.

Turn on the power.
9. When to stop cardiopulmonary resuscitation (CPR)
a) When the injured or ill person has been handed over to the emergency
services
b) When the injured or ill person has started moaning or breathing
normally, lay him/her on his/her side in a recovery position and wait for
the arrival of emergency services.
10. Arrival and preparation of an AED
a) Place the AED at an easy-to-use position. If
there are multiple first-aiders, continue CPR
until the AED becomes ready.
b) Turn on the power to the AED unit. Depending
on the model of the AED, you may have to
push the power on button, or the AED
automatically turns on when you open the
cover.
c) Follow the voice prompts of the AED.
11. Attach the electrode pads to the injured or ill person's bare
chest
a) Remove all clothing from the chest, abdomen, and arms.
b) Open the package of electrode pads, peel the pads off and securely
place them on the chest of the injured or ill person, with the adhesive
side facing the chest. If the pads are not securely attached to the chest,
the AED may not function. Paste the pads exactly at the positions
indicated on the pads, If the chest is wet with water, wipe dry with a dry
towel and the like, and then paste the pads. If there is a pacemaker or
implantable cardioverter defibrillator (ICD), paste the pads at least 3cm
away from them. If a medical patch or plaster is present, peel it off and
then paste the pads. If the injured or ill person's chest hair is thick,
paste the pads on the chest hair once, peel them off to remove the
chest hair, and then paste new pads.
c) Some AED models require to connect a connector by following voice
prompts.
d) The electrode pads for small children should not be used for children
over the age of 8 and for adults.
12. Electrocardiogram analysis
a) The AED automatically analyzes electrocardiograms. Follow the
voice prompts of the AED and ensure that nobody is touching the
injured or ill person while you are operating the AED.
b) On some AED models, you may need to push a button to analyze
the heart rhythm.

Press the shock button.
13. Electric shock (defibrillation)
a) If the AED determines that electric shock is needed, the voice
prompt saying, "Shock is needed" is issued and charging starts
automatically.
b) When charging is completed, the voice prompt saying, "Press the
shock button" is issued and the shock button flashes.
c) The first-aider must get away from the injured or ill person, make
sure that no one is touching him/her, and then press the shock
button.
d) When electric shock is delivered, the body of the injured or ill
person may jerk.
14. Resume cardiopulmonary resuscitation (CPR).
Resume CPR consisting of 30 chest compressions
and 2 rescue breaths by following the voice prompts
of the AED.
15. Automatic electrocardiogram analysis
a) When 2 minutes have elapsed since you resumed cardiopulmonary resuscitation (CPR), the
AED automatically analyzes the electrocardiogram.
b) If you suspended CPR by following voice prompts and AED voice prompt informs you that
shock is needed, give electric shock again by following the voice prompts.
If AED voice prompt informs you that no shock is needed, immediately resume CPR.
16. When to stop CPR (Keep the electrode pads on.)
a) When the injured or ill person has been handed over to the emergency services
b) When the injured or ill person has started moaning or breathing normally, lay him/her on
his/her side in a recovery position and wait for the arrival of emergency services.

ix
Preface
Thank you for purchasing JRC's JHS-800S Marine VHF Radiotelephone. This radiotelephone can
be used as a Global Maritime Distress and Safety System (GMDSS) radio device, compliant with
international regulations, that provides emergency communications and standard
communications capabilities for small and large ships.
●Please read this instruction manual thoroughly before using the equipment.
●Please keep this manual available for future reference.
Please refer to it if any difficulties are encountered when using the equipment.
●Do not use the optional Bluetooth wireless handset when using the GMDSS system.
FCC Warning
Changes or modifications not expressly approved by JRC, could void your
authority to operate this radiotelephone.
FCC: Federal Communications Commission
Radio Frequency Interference Statement
This radiotelephone has been tested and found to comply with the limits for a
Class A digital device, pursuant to part 15 of the FCC Rules. These limits
are designed to provide reasonable protection against harmful interference
when the equipment is operated in a commercial environment. This
radiotelephone generates, uses, and can radiate radio frequency energy and,
if not installed and used in accordance with the instruction manual, may
cause harmful interference to radio communications. Operation of this
radiotelephone in a residential area is likely to cause harmful interference in
which case the user will be required to correct the interference at his own
expense.
RF exposure compliance (MPE* compliance by FCC)
The antenna used for this transmitter must be installed to
provide a separation distance of at least 0.9 meters (3 feet)
from all persons and must not be co-located or operating in
conjunction with any other antenna or transmitter. Users
and installers must be provided with antenna installation
instructions and transmitting operating conditions for
satisfying RF exposure compliance.
* Maximum Permissible Exposure (MPE): The rms and peak electric
and magnetic field strength, their squares, or the plane-wave
equivalent power densities associated with these fields to which a
person may be exposed without harmful effect and with an acceptable
safety factor.

x
Before Operation
Concerning the symbols
This manual uses the following symbols to explain correct operation and to prevent injury
or damage to property.
The symbols and descriptions are as follows. Understand them before proceeding with
this manual.
WARNING
Indicates a warning that, if ignored, may result
in serious injury or even death.
CAUTION
Indicates a caution that, if ignored, may result
in injury or damage to property.
Examples of symbols
The  symbol indicates caution (including DANGER and WARNING).
The illustration inside the  symbol specifies the content of the caution
more accurately. (This example warns of possible electrical shock.)
The  symbol indicates that performing an action is prohibited. The
illustration inside the  symbol specifies the contents of the prohibited
operation. (in this example disassembly is prohibited.)
The  symbol indicates operations that must be performed. The
illustration inside the  symbol specifies obligatory instructions. (In this
example unplugging is the obligatory instruction.)

xi
About Warning Labels
There is warning labels on the main unit (JHS-800S) and the power supply unit (NBD-
980). Do not remove, damage, or alter the warning labels.
JHS-800S Marine VHF Radiotelephone
NBD-980 Power supply

xii
Handling precaution
WARNING
Do not open the equipment to inspect or repair it. Inspection or repairs by anyone other
than a specialized technician may result in fire, electrical shock, or malfunction.
If internal inspection or repair is necessary, contact our service center or agents.
Do not disassemble or customize this unit. Doing so may cause fire, electrical shock, or
malfunction.
Do not get this equipment wet or spill any liquids on or near this equipment.
Doing so may cause electrical shock or equipment malfunction.
Do not touch any of the areas with warning labels.
Doing so may cause electrical shock.
Do not use a voltage other than specified.
Doing so may cause fire, electrical shock, or malfunction.
Do not remove protective covers on the high voltage terminals.
Doing so may cause electrical shock.
Do not insert anything flammable into the equipment.
Doing so may cause fire, electrical shock, or malfunction.
If a distress alert is received, make sure to inform the ship's captain or officer in charge.
Doing so may save the lives of the crews and passengers on the ship in distress.
This unit is also used for the distress communication, in addition to usual communication.
Contact JRC or our agent if any problem is observed in this unit on usual operation or
inspection. Do NOT ignore or leave any problems of this unit.
Always use the specified fuse when replacing a fuse. Using a different fuse may result
in fire or malfunction.
Before replacing fuses of the POWER SUPPLY (NBD-965), always turn off the AC/DC
power switch and power source output to this unit.
In addition to the DC fuse on the panel of the POWER SUPPLY (NBD-965), there are also
AC fuses contained in the unit. Opening and working with the inside of the unit may
result in fire or electrocution, so with the exception of qualified service personnel, do NOT
attempt to replace the AC fuses. To replace the AC fuses, contact JRC or our agent.

xiii
CAUTION
Do not use this equipment for anything other than specified.
Doing so may cause failure or malfunction.
Do not turn the trimmer resistors or the trimmer capacitors on the PCB unit. Doing so
may cause failure or malfunction. They are preset at the factory.
Do not install this equipment in a place near water or in one with excessive humidity,
steam, dust or soot. Doing so may cause fire, electric shock, or malfunction.
Do not test the distress alert as doing so will inconvenience local shipping and Rescue
Centers.
Do NOT turn off the power of the equipment when at sea because the SOLAS
Convention requires keeping CH16 watch at all times.
Always listen to the CH16 except when talking on a specific channel.
To operate DSC and ATIS functions of this equipment, ID numbers must be registered
respectively. If not been registered, contact our agent or service center.
Leave installation of this equipment to our service center or agents. Special knowledge
on selecting the place where the antenna is to be mounted and setting the ID number
(MMSI) assigned to the ship is required besides mounting operation.
When sending a distress alert, follow the instructions of the ship's captain or officer in
charge.
If a false distress alert is transmitted accidentally, use the [CANCEL] button to cancel
transmission of the distress alert. Then report the false distress alert to a nearby RCC
(Rescue Coordination Center). In Japan, inform the nearest Japan Coast Guard. Follow
the on-screen instructions to report the following information.
Ship's name, type, nationality, and ID number, the date/time, location and reason why
the false distress alert was transmitted.
Also the unit model name and manufacture number/date, if possible.
To turn off an alarm or clear a display such as a received DSC message, do NOT press the
DISTRESS button. Doing so may cause a false distress alert.
(Touch the [CANCEL] button to turn off the alarm and delete the on-screen message.)

xiv
CAUTION
When sending a DROBOSE (distress call on behalf of someone else) call, do NOT press
the DISTRESS button. Doing so may cause a false distress alert.
(DROBOSE calls can be sent via [CALL] button displayed on the screen.)
A distress acknowledgement or a distress relay call can be transmitted from a received
distress message stored in the log, but when sending such a kind of call, follow the
instructions of the ship's captain or officer in charge.
In order to avoid accidental distress message treating, received distress messages will be
erased automatically after 48 hours elapsed since the reception. Accordingly, if such
messages cannot be read out, it is NOT a malfunction.
The time set in the menu DATE&TIME [1/2]DATE shows the current time. It is not
reflected in the time in POS/TIME [2/2]UTC POS (the time when the ship was in that
position according to the position information).
The time set in the menu POS/TIME [2/2]UTC POS shows the time when the ship was in
that position according to the position information. It is not reflected in the time (current
time) in the menu DATE&TIME [1/2]DATE.
Close the water-resistant cap of the waterproof type handset box after use. Rain and sea
breeze could cause connector malfunction. Also do not leave the handset above deck.
The thermal head of the printer may be very hot after printing. Do not touch it.
Perform paper replacement and head cleaning only after waiting for the head to
completely cool.
Do not put your finger etc. because there is a cutter blade at the paper discharge port.
Also, do not touch the blade of the cutter when opening the paper cover.
The printing paper used in this printer is a heat sensitive paper. Take the following
precautions when using this paper.
· Store the paper away from heat, humidity, or heat sources.
· Do not rub the paper with any hard objects.
· Do not place the paper near organic solvents.
· Do not allow the paper to come in contact with polyvinyl chloride film, erasers, or
adhesive tape for long periods of time.
· Keep away the paper from freshly copied diazo type or wet process copy paper.
Always set the expanded MMSI in the bridge of the vessel to zero (0). If setting to
another value other than zero, DSC calls may not be received.
Do not carry out operation of touch panel by a sharp object.
Otherwise, the screen may be damaged.
If power outage occurs inside of the ship during the operation of this unit, the image may
be disturbed or may not be displayed.
In this case, reconnect the power supply.

xv
Sending a Distress Alert
CAUTION
When sending a distress alert, follow the instructions of the ship's captain or officer in charge.
1
1
1.
.
. Open the protective cover on the DISTRESS button for the JHS-800S MARINE VHF
RADIOTELEPHONE or NCM-980 CONTROLLER.
2
2
2.
.
. Press and hold the DISTRESS button for at least 3 seconds until the countdown is
completed.
When the countdown is finished, the screen below on the right is displayed and after confirmed that the
channel is free or after 1 seconds, whichever occurs first, the distress alert is transmitted. On the controller,
"DISTRESS PRESSED / BY (controller name) AND START" is displayed.
3
3
3.
.
. After sending the distress alert, wait for an acknowledgement.
The radiotelephone can be used to communicate even while waiting for an acknowledgement. When an
acknowledgement is received, touch the [STOP] button to cancel the alarm on the below right screen, and
communicate with the station. Unless an acknowledgement is received or the distress alert is cancelled
manually, the equipment repeats the distress alert every 3 minutes 30 seconds to 4 minutes 30 seconds.
4
4
4.
.
. After receiving acknowledgement, lift the handset and request rescue using CH16 of
the radiotelephone.
First, the responding station calls by radiotelephone. Communicate the following information to that station.
Say "MAYDAY", "This is (name of your ship)", Tell the ship's Maritime Mobile Service
Identity number, call sign, ship's position, nature of distress, and rescue requests.
D
D
DI
I
IS
S
ST
T
TR
R
RE
E
ES
S
SS
S
S A
A
AL
L
LE
E
ER
R
RT
T
TS
S
S

xvi
If time permits, enter the nature of the distress as follows, just before sending the distress alert.
(For more details, see 4.4.5.2.)
1) In the main menu, touch the [DIST-E]
buttons.
2) In the screen shown on the right,
touch the [EDIT] → [NATURE] button,
and then use the [+]/[-] buttons to
select the nature of your distress.
3) Touch the [ ✓ ] button.
After the nature of your distress is set,
the DIST-E menu appears. If the
position and time are not displayed
automatically, select the [EDIT]→[POS]
and [EDIT]→[UTC] buttons and input
them manually.
4) Press and hold the DISTRESS button
for at least 3 seconds until the
countdown is completed.
The rest of the procedure is the same as
described above.
Terminating a Distress Alert
CAUTION
If a false distress alert is transmitted accidentally, use the [CANCEL] button to
cancel transmission of the distress alert. Then report the false distress alert to a
nearby RCC (Rescue Coordination Center). In Japan, inform the nearest Japan
Coast Guard. Follow the on-screen instructions to report the following
information.
Ship's name, type, nationality, and ID number, the date/time, location and reason
why the false distress alert was transmitted.
Also the unit model name and manufacture number/date, if possible.
Touch the [CANCEL] button.
The popup shown below is displayed. Touching the [CONT] button cancels transmission of the distress alert.
After that, follow the on-screen instructions.
Note) For more details, see the description in the 4.4.5.1 Quick distress alerts.
Note

xvii
Receiving a Distress Alert
WARNING
If a distress alert is received, make sure to inform the ship's captain or officer in charge.
Doing so may save the lives of the crews and passengers on the ship in distress.
1
1
1.
.
. When a distress alert is received, the information such as the ID number of the ship in
distress and the stage of the distress event are displayed.
If the equipment is not used, i.e. there is no active procedure at that time, the CH16 is set and the Receive
mark starts blinking, and the alarm gradually grows louder.
2
2
2.
.
. Touch the [STOP] button to stop the alarm.
Keep watch on CH16 for at least 5 minutes, and notify the coast station as appropriate.
3
3
3.
.
. Touch the [ACK] button to respond from your own ship with the results of coordinating
with the coast station and monitoring CH16.
After sending it, commence distress traffic via radiotelephony on CH16 as follows.
 Say "MAYDAY",
 Repeat the identity (MMSI) of the ship in distress 3 times,
 Say "This is",
 Repeat the identity (MMSI) of your ship 3 times,
 Say "RECEIVED MAYDAY".

xviii
Equipment exterior
●JHS-800S Marine VHF Radiotelephone/NQW-980 Handset
●NCM-980 VHF Controller/NQW-980 Handset