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20
PATROL ROUTINE
 
A. INTRODUCTION
 
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 particularsubmarine.
 
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 relieve.

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 extended.

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 rainclothes 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 speed.

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,

 
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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 the bow.

Habitually require a smart trim from your diving officer for the depth at which you are running.

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 the time).

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 surface, alarm.

  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 (or aft)."

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 to stern.)

Note the condition of the 20-mm guns and be prepared to man or direct the fire as directed by the OOD.

 
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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 as follows:

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 orders.

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 relieved.

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 watch.

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 routine duties:

Break out binoculars, dark glasses, proper flares, and blinker tube prior to surfacing; also issue lens paper to lookouts.

Obtain warmer clothing or rainclothing for lookouts.

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 setting.

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

 
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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 tower.

Periodically check the compensation by liquidometer gages.

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, OOD.

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 Mess.

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 surface.

Keep submerged identification signal available as directed by OOD.

Maintain the air banks at proper pressure.

See that all the topside reliefs are properly clothed.

Keep the control room clear of all loose gear.

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 air change.

  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 lookout 350 degrees - 130 degrees (relative).

After lookout 120 degrees - 240 degress (relative).

Port lookout 230 degrees - 010 degrees (relative). In the event that four lookouts are used, sectors are assigned as follows:

Starboard forward lookout 350 degrees - 100 degrees (relative).

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

 
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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) above.

During darkness, the search will be as follows:

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 advantages:

It provides a systematic coverage of the entire area.

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 eye sweeps.

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 an acknowledgment.

Do not take eyes or binoculars off the object you have sighted.

Report everything.

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 sounds.

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

 
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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 bridge."
     2. Check all hands below.
     3. Sound two blasts on the bridge diving alarm as the last lookout passes the OOD.
     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 warrant.

B. Quartermaster.
     1. Be last down hatch and shut hatch.

C. Junior officer of the deck.
     1. Be among the first down the hatch if on the bridge.
     2. Proceed immediately to diving station.
     3. Assume control of dive, carrying out procedure listed under control room.

D. Lookouts.
     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.

F. Helmsman.
     1. Put the rudder on as ordered; otherwise amidship.

  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 valves.
     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 submerged stations.

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 boat.
     6. Put the stern planes on dive to take the ship to the ordered depth with a 4- to 6-degree angle.

 
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     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 tank inboard.
     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 torpedo room.
     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 exacting search.
     3. Keep the periscope watch as directed.
     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 two-thirds speed.
     g) After steps a) to e) have been carried out, announce to control, "Carry out all routine below."

b. Helmsman.
     1. When the surfacing alarm is sounded, ring up two-thirds speed unless otherwise ordered.

c. Quartermaster.
     1. Stand by the hatch.
     2. Sound the surfacing alarm on orders of the C.O. only.
     3. Open the hatch on orders from the C.O.

d. Assistant navigator (quartermaster).
     1. Keep the C.O. informed of keel depth and pressure in boat.

e. Control.
     1. Start the hydraulic plant at 50 feet.
     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

 
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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 below" means:
     a) Have the battery charge started.
     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 supply blowers.
     f) Start the air change after stopping the turbo blow.
     g) Swab down and clean all compartments.
     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 desired.
     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 normal routine.

  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 tower.

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.

 
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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 observation.

d. Make sufficient all-around

  observations for air patrol and other surface patrol craft.

e. Make observations frequently.

f. As range decreases, run at deeper depth.

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 continuously.

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 on.

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 order.

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 carried out.

 
F. STANDARD PHRASEOLOGY
 
20F1. Examples of standard phraseology.
The following is the standard phraseology to be used on phones and when passing the word:

a. Torpedoes.
     1. Make ready the bow (stern) tubes.
     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 (automatic).

       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 (left).
     7. Depth 60 (etc.) feet.
     8. Emergency, 200 (150) feet.
     9. Take her down.
     10. Rig ship for depth charge attack.
     11. Stand by to dive (clear the bridge).

 
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     12. What is the log distance?

c. Target.
     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 15-25)
     4. Target is maru (destroyer) (man-o-war) etc.
     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 attack.
     4. Forward room rigged for depth charge attack.
     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 tower) radar.
     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 the blowers.
     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 tension.
     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.

 
200

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