20A1. Foreword. The following patrol instructions are a compilation of instructions
used by various submarines. Naturally, there
may be some minor differences between these
instructions and those used by a particular submarine.
B. DUTIES OF WATCH STANDERS
20B1. Officer of the deck. On the surface,
the officer of the deck stands his watch in
the forward bridge structure. Although he
is expected to remain intensely alert and
observant, he is not a lookout and must not
become engrossed in a detail of his watch or
a lookout sector to the exclusion of his comprehensive duties as supervisor of the watch.
His responsibility when the ship is submerged is no less than when on the surface.
and a similar degree of alertness is required
in carrying out the routine and direction of
the watch. The duties of the officer of the
deck as outlined in Navy Regulations, are
supplemented as follows:
Keep the number of persons on the
bridge to a minimum, requiring permission
to come on the bridge in each case.
Allow only one relief of any watch on
the bridge at a time, with the exception that
besides one lookout relieving, the quarter
master or junior officer of the deck may
Insure yourself that the lookout's vision
has become dark-adapted before allowing
him to relieve the watch. A reasonable test
is the lookout's ability at a distance of about
5 feet to note how many fingers you have
Keep the lookouts alert and insure that
they are properly covering their sectors.
Insist on standard phraseology in all
reports, with prompt acknowledgments.
Maintain the passageway to the hatch
clear at all times.
Insure that the quartermaster orders
rain clothes for the watch in sufficient time
to permit one person at a time to don them
prior to arrival of a squall. Place the lookouts where they will be of most advantage.
Keep them as dry as possible and out of high
wind. A comfortable lookout is much more
efficient than an uncomfortable one.
The following rules apply generally, but
in no way restrict the officer of the deck from
acting as his judgment dictates:
Dive for all aircraft contacts, except as
specifically directed by previous instructions
of the commanding officer.
Turn toward a periscope forward of the
beam and go to full speed. Turn away from
a periscope abaft the beam and go to full
Turn away from all fishing vessels or
small craft unless ordered by the commanding officer to attack.
Turn away from unidentifiable objects.
Turn toward a target, but dive in sufficient time to insure that your ship is not
sighted prior to firing torpedoes.
Present the smallest target possible by
turning toward or away from any type of
contact as the situation dictates.
In friendly waters, or when contact with
own forces is probable, have daily recognition signals written in chalk on wind screen.
Know and insure that all bridge personnel on watch know the current signals in
effect, and that recognition gear is in complete readiness as follows:
1. Searchlight tested if rigged.
2. Blinker tube readily accessible.
3. Flares and rockets changed at proper times.
Carry out the following details or routine:
Approximately 15 minutes before diving
secure the 20-mm guns and ammunition.
Carry out the diving procedure.
After daylight and torpedo routining,
the depth at which to run during and between looks will depend on the state of the
sea and the proximity of enemy air bases,
as directed by the commanding officer.
When landmarks are available, keep the
ship's position cut in, using periscope exposures of short duration only.
In making periscope observations, first
sweep the horizon and sky in low power for aircraft or close surface craft. Follow this,
if all clear, by a slow deliberate search in
high power, not exposing the periscope for
more than 15 seconds. Develop the habit of
obtaining a complete picture of the weather
during your observation. Have the quartermaster note the keel depth during the observation and also tell you when 15 seconds
of periscope exposure has occurred.
When the target is sighted, sound the
general alarm, or pass the word over the telephone if the target is likely to hear the alarm,
and commence the approach immediately.
Minutes or seconds may be just as valuable
then as later in the attack, and certainly are
if the target is presenting a large angle on
Habitually require a smart trim from
your diving officer for the depth at which you
Notify the commanding officer when
darkness is almost ready to set in and obtain
the time of surfacing from him. Commence
the surfacing procedure.
Ten minutes prior to surfacing, the commanding officer comes to the conning tower
and relieves the watch. The junior officer of
the deck of the previous watch relieves the
diving officer a half hour prior to surfacing.
Normally, just prior to surfacing, the ship
is brought to 50 feet for SD sweep, then to
40 feet for SJ sweep (sound sweeping all
If "All clear on radar" is indicated, pass.
the work over the loudspeaker, " Stand by to
surface ......... engine combination."
The commanding officer will then direct the
surface alarm be sounded.
Carry out surfacing procedure on the
Obtain the commanding officer's permission prior to the following:
1. Permitting anyone on deck.
2. Putting any piece of machinery or
armament out of commission.
3. Pulling a torpedo from any tube.
4. Anything that may reduce the fighting ability of the ship or her ability to dive.
For every sighting while on the surface
that might develop into an attack, sound the
general alarm and let the rest of the ship
know something is happening.
Whenever the need arises to make ready
torpedoes, order " Make ready tubes forward
Keep the junior officer of the deck informed of changes of speed, course, or any
other pertinent information so that he will
be able to assume the deck at any time.
20B2. Junior officer of the deck. The junior
officer of the deck stands his watch as directed
by the commanding officer. He may act in
any one of three capacities as follows:
As junior officer of the deck, stationed
forward or aft the cigarette deck. (If aft,
quartermaster should go forward.)
As junior officer of the deck, stationed
in the conning tower.
The junior officer of the deck watch
normally is stood only while on the surface.
Until all officers are fully qualified as diving
officer, the junior officer of the deck normally
acts as diving officer submerged. However,
if qualified by the commanding officer, he may
interchange with the OOD for periscope
watches if practicable.
Duties of the junior officer of the deck
are as follows:
Supervise the lookouts to insure that
they are covering their sectors properly.
Observe to insure that any enemy that
might possibly get by the lookouts does not
approach, unobserved, to close range. (If
forward, observe from broad on opposite bow
Note the condition of the 20-mm guns
and be prepared to man or direct the fire
as directed by the OOD.
Report immediately to the officer of the
deck own engine smoke, sparks, or any unusual condition.
Proceed to diving station or below on
orders of the officer of the deck or on " Clear
the bridge." Carry out the diving procedure.
Conduct the periscope watch as directed.
Man the TDC and otherwise assist the
OOD in conducting initial stages of any approach as directed.
The junior officer of the deck should be
fully aware of the condition of the boat and
prepared to assume the capacity of the officer
of the deck at any time.
20B3. Conning tower talker watch. The
conning tower talker watch is normally stood
at all times when at sea. Conning tower
talker watches are stood as indicated on the
Watch, Quarter, and Station bill.
The duties of this watch may be outlined
Instruct new steersmen in their duties.
Make all necessary entries in the Quartermaster Notebook.
Act as voice link between sound, radar,
control, maneuvering, and bridge watches.
Supervise zig plan if in use.
Take and record TBT and heading bearings on bridge buzzer marks.
Act as telephone watch.
Keep conning tower clear of loose gear.
Under supervision of the chief petty
officer of the watch, permit but one relief
for any watch to proceed to the bridge.
At night, check and carry out the night
Upon surfacing, check TBT's with the
quartermaster as directed.
Assist the quartermaster in maintaining deck log columns.
Maintain quiet in the conning tower and
keep an alert watch. Report to the OOD
when the conning tower watch is properly
Know exactly where all the conning
tower alarms are and operate them only
when ordered to do so by the bridge.
20B4. The steersman. The steersman is normally stationed in the conning tower, unless
otherwise ordered by the officer of the deck.
The duties of the steersman are as follows:
Maintain the course.
Operate the maneuvering room annunciators as ordered by the bridge.
Know the duties of the conning tower
Assist the conning tower watch as necessary and be able to take over at any time.
Know exactly where all conning tower
alarms are and operate them only when
ordered to do so by the bridge.
20B5. Quartermaster of the watch. The
quartermaster of the watch normally is stationed on the bridge, aft when cruising, and
may exchange with the OOD if ordered. He
is an additional all-around lookout and does
not restrict his search to any one sector
unless so ordered by the officer of the deck.
The quartermaster is responsible under
the direction of the OOD for the following
Break out binoculars, dark glasses, proper
flares, and blinker tube prior to surfacing;
also issue lens paper to lookouts.
Obtain warmer clothing or rain clothing
Change flares at the proper time.
Check TBT's upon surfacing each night.
Wipe the periscope windows on surfacing and 15 minutes before routine dives.
Operate the periscope, keep the periscope
officer informed of depth, and read and record
bearings when submerged.
Keep the conning tower clean, and all
gear properly stowed when submerged.
Check columns of deck log after being
relieved to make sure that the proper entries
have been made. Do this in the control room.
Once every hour on surface, check the
lookouts' glasses for cleanliness and proper
20B6. Chief petty officer of the watch. The
CPO of the watch remains in the control
room. He is charged with running the below
deck routine, supervising the control room
watch when on the surface, and with carrying out the details of the Watch Bill. He
initiates the diving procedure on the diving
alarm, until relieved of the dive by the
diving officer. In carrying out his duties, he
must pay particular attention to the following:
Call the oncoming watch in sufficient
time for them to relieve 15 minutes before
the hour, in accordance with naval custom.
At night, insure that each oncoming
lookout is fitted with and wears dark adaptation goggles continuously for at least 20
minutes before being allowed to proceed to
the conning tower.
Insure that only one relief proceeds to
the conning tower at a time.
Promptly acknowledge any orders or
word passed from the bridge or conning
Periodically check the compensation by
Insure that the proper watch is maintained on the control room (SD) radar when
ordered manned, and that any contact, however doubtful, is reported instantly to the,
Maintain quiet and allow no loitering in
the control room.
Half an hour prior to surfacing, rig the
hatch skirt. Turn out the white lights; turn
on the red as designated for the control room.
Execute the 2200 lights out in the crew's
At the end of each watch, and approximately 1 hour before diving, pump the bilges
and blow the sanitary tanks to the sea.
Keep the manometer needles matched on
Keep submerged identification signal
available as directed by OOD.
Maintain the air banks at proper pressure.
See that all the topside reliefs are
Keep the control room clear of all loose
About 1 hour before surfacing when
directed by the OOD, pump down the pressure in the boat to one-tenth.
After surfacing, carry out the evening
routine which consists of the following:
1. After the blowers are secured, start
2. Pump all the bilges to the sea.
3. Blow all the sanitary tanks.
4. Collect all trash and garbage and
when properly sacked, report to the bridge,
"All trash and garbage assembled," and
dump it when directed.
Carry out evening compensation as
directed by the diving officer.
When orders to the steersman for changes
of course or speed come from the bridge
over the system, observe the motor order
telegraph repeater or rudder angle indicator
in the control room to check that the order is being carried out properly.
Keep the compass check book, making
entries as required by the navigator. Instructions will be posted in the front of the book.
While submerged, whenever word is passed
from the conning tower, "Man battle stations," dispatch one man forward and one
man aft with the order, "Pass word quietly,
wake all hands. Battle stations submerged."
20B7. Lookouts. Normally there are three
lookouts assigned overlapping sectors as follows:
Starboard after lookout 080 degrees - 190 degrees (relative)
Port after lookout 170 degrees - 280 degrees (relative).
Port forward lookout 010 degrees - 260 degrees (relative).
During daylight, each lookout searches
his sector in the following sequence using
a sun filter only when searching into the sun:
a. Search the water to the horizon for
one-half of his assigned sector.
b. Lower the binoculars for approximately 10 seconds to survey entire sector,
water, and sky, with naked eye. Continue
search of water to horizon over the remainder
of the sector. Search the horizon and lower
sky for one-half of the assigned sector. Lower
binoculars for approximately 10 seconds to
survey the entire sector, water and sky with
the naked eye. Continue search of the horizon and lower sky over the remainder of the
sector. Repeat 10-second sweep of the entire
sector with naked eye. Search the upper sky,
above the belt observed when searching the
horizon and lower sky, for one-half of assigned sector. Lower binoculars for approximately 10 seconds to survey the entire sector,
water and sky, with naked eye. Continue
search of upper sky for remainder of sector.
Repeat 10-second sweep of entire sector with
naked eye. Recommence, starting with (a)
During darkness, the search will be as
a. Moonlight nights when enemy air
search is possible: After each complete sweep
of sector, search sky sector with naked eye.
b. Dark nights: Eliminate sky search.
This method of search has the following
It provides a systematic coverage of the
It gives maximum insurance against any
plane, which was outside the field of the
binoculars, closing unobserved to close range.
Provides best assurance that a periscope
lowered during the binocular search, will be
sighted if dangerously close during the naked
General instructions to lookouts:
Save your eyes. All lookouts should rest
their eyes before coming on watch. They
should try to take care of all calls of nature
before going on watch.
If a lookout does not feel physically up
to standing an all-out lookout watch, he
should report this to the OOD.
Make all reports of sightings immediately. It is better to be wrong 100 times
than miss one ship.
Use relative bearings in all reports.
Then, followed by your best estimate of the
range, add more information as it becomes
available, stating identity of ship and so forth.
Call out your reports so that all can
hear. Make certain your report is
acknowledged and keep on reporting until you get
Do not take eyes or binoculars off the
object you have sighted.
Upon assuming your post after surfacing, make a complete search of your sector.
Report in a loud clear voice, "......... sector all clear, sir."
At night, don't attempt night duties until
dark-adapted; avoid short cuts. Practice use
of the corners of the eyes, remembering that
objects are better seen in dim light if not
located in the center of vision. Move the eyes
frequently, remembering that night vision is
most sensitive immediately after the line of
sight has been shifted. When relieving, make
certain that no other bridge watch is being
relieved, then request, "Permission to come
on the bridge to relieve lookout." Relieve
with a minimum of noise and confusion. Get
dressed below for the existing weather conditions.
20B8. Sound watch. a. General. The sound
watch normally is stood whenever speed
conditions permit. The operator must, without seeking confirmation or help from anyone,
report immediately to the officer of the deck
any echo ranging, propellers, or unusual
b. Instructions for standing sound
watches. The safety of the ship and its personnel is directly dependent upon the manner
in which this watch is stood. This responsibility is greatly increased at night and a
resultant increase in attentiveness is imperative.
This watch must be stood in regulation
manner. Submerged, each man upon being
relieved reports to the officer of the deck,
"Sound watch relieved by ...............,
Sound conditions are (good, fair, poor)." On
Surface, report to the conning tower talker
that you have been properly relieved.
Soundheads are to be used in accordance
with communication officer orders posted at
the sound gear.
If for any reason, you have difficulty
interpreting what you hear, or the equipment
does not appear to be operating correctly,
inform the officer of the deck at once, and
call for one of the battle station soundmen
at the same time without any further orders.
c. Additional information regarding
night sound, watches. Soundheads should not
be left lowered above 10 knots.
When two soundmen are on watch at
the same time, both soundheads are lowered.
The starboard (JK) operator covers the
sector from zero to 180, and the port (CQ)
operator covers the sector from 180 to 360.
Each soundhead should be rotated 360 degrees on alternate sweeps.
If screws are heard, they are to be
reported immediately, stating " Screws at
......... relative, (high or low) speed."
Then obtain the closest true bearing and
report, " True bearing ........." Thereafter, report any change in speed of screws,
and if you can no longer hear them. Changes
of bearing when own ship is on a steady
course are very important. Keep the information coming.
C. DIVING AND SURFACING PROCEDURES
20C1. Diving procedure.
A. Officer of the deck.
1. Pass the word, " Clear the
2. Check all hands below.
3. Sound two blasts on the bridge
diving alarm as the last lookout passes the
4. When below, check report pressure in the boat and order the depth desired.
5. Commence attack, evasive tactics, or rig for depth charge as conditions
1. Be last down hatch and shut
C. Junior officer of the deck.
1. Be among the first down the
hatch if on the bridge.
2. Proceed immediately to diving
3. Assume control of dive, carrying out procedure listed under control room.
1. Clear the bridge on the double
man diving stations in accordance with the
Watch. Quarter, and Station Bill.
E. Conning tower talker watch.
1. Sound the general alarm if
ordered by the OOD.
2. Lower the periscope if it is up.
1. Put the rudder on as ordered;
2. Ring up full speed on the annunciators.
G. Maneuvering room.
1. Answer bells as ordered.
2. Shut the maneuvering room induction hull valve.
H. Engine room. Procedure in the engine room is carried out in this order
1. Stop the engines.
2. Shut the outboard exhaust
3. Shut the engine and supply
ventilation induction hull valves.
4. Shut the bulkhead flappers.
5. Shut the inboard exhaust valves.
6. If everything is in order in the
engine rooms-oilers to control room-for
I. Control room.
1. Open the vents.
2. Rig out the bow planes and put
them on 22-degree dive.
3. When all outboard exhaust
valves are shut or when passing 23 feet shut
the engine air induction and the ship's supply outboard valve.
4. Bleed air in the vessel and secure
air on orders of the diving officer only in
case the torpedo rooms do not bleed in air.
5. Note and report pressure in
6. Put the stern planes on dive to
take the ship to the ordered depth with a
4- to 6-degree angle.
7. Shut the bow buoyancy at 30
feet and open the safety for 5 seconds; then
shut it. Shut all vents at 50 feet.
8. Blow the negative to 1,500
pounds in two steps.
9. Reduce the speed and adjust the
trim as necessary.
10. Shut the negative flood and vent
11. Make certain that the periscopes are cut in.
12. When convenient, open all bulkhead flappers and resume normal hull ventilation.
J. Crew's mess.
1. Report the engine air induction
and hull ventilation valves shut by hand
signal to control room.
2. Lock the above valves shut as
soon as possible and report to control.
K. All stations.
1. Shut the bulkhead flappers.
L. Forward torpedo room and after
1. Bleed air into the vessel and
secure on word from the control room.
M. Radio room.
1. Disconnect the antenna lead and
shut the trunk flapper.
The conning officer retains speed control
at all times, However, this will not interfere
with or necessitate any hesitation by the
diving officer to request speed changes to
facilitate depth control.
20C2. Surfacing procedure.
a. Duties of the officer of the deck.
1. Prior to surfacing, carry out
surfacing routines as outlined in the front
of the QM notebook.
2. Have the sound watch make an
3. Keep the periscope watch as
4. Give control any changes in
ordinary surface procedure.
5. Pass the word, "Stand by to
surface ......... engine combination."
6. Follow the commanding officer
and the quartermaster to the bridge. (The
JOOD follows the OOD to the bridge.)
7. On surfacing, be prepared for
immediate diving should circumstances warrant such action.
8. Upon proceeding to the bridge,
the OOD takes the starboard side and
searches, the JOOD takes the port side, and
the QM the after half of ship. When all
three have reported, "All clear," call to
conning tower, "Routine."
9. When the word, "Routine" is
passed, the officer in the conning tower sees
that the following procedure is carried out:
a) Main induction opened.
b) Lookouts to the bridge.
c) Engines are automatically
started on opening of induction.
d) Turbo blow for 6 minutes.
c) Gunner's mate to bridge to
rig 20 mm.
f) Rig in soundhead if going
g) After steps a) to e) have
been carried out, announce to control, "Carry
out all routine below."
1. When the surfacing alarm is
sounded, ring up two-thirds speed unless
1. Stand by the hatch.
2. Sound the surfacing alarm on
orders of the C.O. only.
3. Open the hatch on orders from
d. Assistant navigator (quartermaster).
1. Keep the C.O. informed of keel
depth and pressure in boat.
1. Start the hydraulic plant at 50
2. Rig in the bow planes when
the word is passed to stand by to surface
......... engine combination.
3. Blow the bow buoyancy and
main ballast, except the safety, on the third
blast of the surface alarm. Surface with
3-4 degree rise angle and secure the air when
at 30 feet.
4. When the conning tower hatch
shows a red light, and the hatch is heard
to open, vent and flood the negative. Vent
and shut the safety.
5. Open the main induction on
orders from the conning tower.
6. Put the low-pressure blowers
on tank as directed.
7. CPO of the watch: Carry out
routine as directed. "Carry out all routine
a) Have the battery charge
b) Blow all the sanitary tanks.
c) Pump all the bilges in succession from aft to forward.
d) Assemble trash and garbage in control room.
c) Speed up the exhaust and
f) Start the air change after
stopping the turbo blow.
g) Swab down and clean all
h) Report to the bridge that
"All routine is being carried out below."
8. Be prepared to dive again immediately.
f. Crew's mess.
1. Unlock and put the hull ventilation supply and engine air induction valves
on power, on "Stand by to surface." Report
to control when this is accomplished.
g. Maneuvering room.
1. Answer bells as ordered. After
the surface alarm is sounded, shift to surface rpm.
2. Ring up "Start" on the engines
3. Shift to engines for propulsion
when the engine room is ready and start
the battery charge as soon as possible.
4. Report to the conning tower as
soon as the battery charge is started.
h. Engine room.
1. When "Start" is received from
the maneuvering room and when the outboard engine air induction valve is opened,
start the engines as ordered, Carry out the
20C3. Check-off list prior to surfacing.
a. Procedure 30 minutes prior to surfacing
1. Pump down the pressure in the
boat to 0.1 inch upon orders of the C.O.
2. Start the hydrogen detectors
and line up the battery ventilation for charge.
Take individual cell reading.
3. Call the lookouts and have them
dress appropriately for the weather.
4. Quartermaster: Clean all binoculars and get dressed to go to the bridge.
5. Bring .45-caliber pistol and submachine gun to the conning tower with two
drums of ammunition.
6. Get readings on all sanitary
tanks, bilges, and fresh water tanks and
record them for final trim estimate.
7. Rig the curtain in the control
room. Darken the control room and conning
b. Procedure 15 minutes prior to surfacing.
1. Notify the maneuvering room
and engine rooms to stand by engine combination in accordance with night orders.
2. Check to ascertain that all lookouts are in the control room dressed to go
on watch with dark glasses.
3. Navigator: Relieve the OOD to
get dressed for surfacing.
4. Diving officer on proceeding to
watch: Relieve the diving officer to get
dressed for surfacing and the JOOD watch.
5. Trim manifold man: Relieve
the bow planesman to get dressed for surfacing.
6. Start up the SJ radar and have
the radio technician man the SJ radar in
the conning tower.
c. Procedure upon surfacing.
1. Immediately upon surfacing,
stern planesman and trim manifold man go
to the engine rooms.
D. APPROACH OFFICER
20D1. Approach officer's check-off list.
a. Make torpedoes ready early, Set
the depth and speed on the torpedo.
b. Give the identification officer all necessary information early.
c. Slow sufficiently for safe periscope
d. Make sufficient all-around
observations for air patrol and other surface patrol
e. Make observations frequently.
f. As range decreases, run at deeper
g. Keep the ship informed of progress
of approach as consistent with circumstances.
h. Rig the ship for depth charge attack.
E. TORPEDO ROOMS
20E1. Instructions for torpedo rooms.
a. At least one qualified torpedoman
must he on watch in each torpedo room at
all times. The phones should be manned
b. Gyro spindles should be engaged at
all times, and in the absence of other instructions, torpedoes set on 0 degrees forward and
180 degrees aft.
c. Unless otherwise instructed by proper
authority, the condition of the gyro regulators should be:
1. Clutch in automatic and switch
d. All torpedoes are to be set for high
speed and 10-foot depth until ordered changed
from the conning tower. Depth setting
spindles should be left disengaged.
e. When the order, "Make ready the
tubes forward (aft)" is received, all tubes
in the nest must be made ready as rapidly
as possible and, as far as possible, in numerical order.
f. Unless word is received to the contrary, the firing order is always in numerical
g. Tubes should always be flooded from
WRT. In case of an emergency, when submerged, that prevents tubes from being
flooded from WRT, request permission from
the diving officer to flood the tubes from the
sea. If on the surface, notify the diving
officer, and flood from the sea.
h. The senior torpedoman in each room
is responsible for these orders being properly
F. STANDARD PHRASEOLOGY
20F1. Examples of standard phraseology.
The following is the standard phraseology to
be used on phones and when passing the
1. Make ready the bow (stern)
2. Set torpedo depth 10 feet.
3. What is the torpedo run?
4. What is the gyro angle?
5. Do the bow (stern) tubes bear?
6. Check fire (or cease fire).
7. When gyro angle is zero, commence firing.
8. Use one (six) torpedoes.
9. Use angle, speed, bearing (periscope) spread.
10, Set gyro regulators in hand
11. Stand by one, and so on. Fire
one, and so on.
12. What is the torpedo track angle?
b. Own ship-fire Control.
1. What is the pit log speed?
2. Pit log speed is .........
3. What is our head(ing) (course)?
4. Our head(ing) (course) is
5. Left (right) 5 degree rudder.
6. Rudder is 5 degree (10 degree) (full), right
7. Depth 60 (etc.) feet.
8. Emergency, 200 (150) feet.
9. Take her down.
10. Rig ship for depth charge
11. Stand by to dive (clear the
12. What is the log distance?
1. (Generated) angle on the bow
is ......... starboard (port).
2. Estimated (generated) (radar)
(sound) range, five oh double oh.
3. Estimated target speed .........
knots (low 2-10) (moderate 10-15) (high
4. Target is maru (destroyer)
5. Target (relative) (Sound)
(Radar) (True) (generated) bearing is .........
6. Estimated (generated) target
course is .........
7. Stand by for a set-up.
8. Target estimated length is .........
9. Target track angle is .........
10. Set-up is good. (T.D.C. set-up.)
d. Own ship: administration.
1. Put low-pressure blowers on all
main ballast tanks for ......... minutes.
2. What time is it?
3. Rig ship for depth charge
4. Forward room rigged for depth
5. Open all bulkhead flappers, resume normal hull ventilation.
6. Get ready on the engines.
7. Shift to the battery.
8. Man the sound gear. (Station
the sound watch.)
9. Man the radio room (conning
10. House the underwater log.
11. Rig out the underwater log.
12. Lower and lock the port (starboard) soundhead.
13. Raise and lock the port (starboard) soundhead.
14. Open the main induction, start
15. Lookouts to the bridge.
e. Orders to the men on the lines. Slack off: Pay out the line, allowing
it to form an easy bight.
Take a strain: Put the line under
Take in the slack: Heave in on the
line, but do not take a strain.
Ease it, Ease away, or Ease off:
Pay out enough to remove most of the strain.
Check Number .........: Hold the
line, but render it enough when necessary so
that it will not part.
Hold Number .........: Take sufficient
turns that the line will not give.
Double up and secure: Run any additional lines and double all of them as necessary.
Stand by your lines: Man the lines,
ready to cast off.
Cast off Number .........: Let go
Number ......... line.