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Calculating Mortar Data

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Description

B-GL-385-015/PT-001

LAND FORCE

INFANTRY

INSTRUMENTS FOR CALCULATING MORTAR FIRING DATA (ENGLISH) (Supercedes B-GL-317-009/PT-Z01,

THIS PUBLICATION,

OR ANY PART OF IT,

MAY BE EXEMPT FROM DISCLOSURE TO THE PUBLIC UNDER THE ACCESS TO INFORMATION ACT

ALL ELEMENTS OF INFORMATION CONTAINED HEREIN MUST BE CLOSELY SCRUTINIZED TO ASCERTAIN WHETHER OR NOT THE PUBLICATION OR ANY PART OF IT MAY BE RELEASED

Issued on the Authority of the Chief of the Land Staff OPI: DAD 4-2

2001-10-30

Instruments for Calculating Mortar Firing Data

FOREWORD 1

B-GL-385-015/PT-001 Instruments for Calculating Mortar Firing Data is issued on the authority of the Chief of Land Staff

B-GL-385-015/PT-001 Instruments for Calculating Mortar Firing Data is effective upon receipt

B-GL-385-015/PT-001 Instruments for Calculating Mortar Firing Data supercedes B-GL317-009/PT-Z01 dated Oct 89

The French version of this publication is B-GL-385-015/PT002 Instruments pour calculer les donées de tir des mortiers

Comments and suggestions for changes may be forwarded through the usual channels to Land Forces Doctrine and Training System,

Directorate of Army Doctrine,

Attention DAD 4-2

Unless otherwise noted,

masculine pronouns appearing herein refer to both genders

© 2001 MDN Canada

Instruments for Calculating Mortar Firing Data

PREFACE AIM 1

This publication has been issued for personnel who use and teach the use of the plotter and the Mortar Fire Data Calculator (MFDC)

SCOPE 2

The purpose of this publication is to combine parts of the following two publications: a

B-GL-317-009/PT-000 The Mortar in Battle

B-GL-317-009/PT-Z01 Mortar Computers

FORMAT 3

The content is given in the form of lesson plans to facilitate training and to ensure standard procedures for using instruments

units shall not alter or change procedures set out in this publication

Further,

all instructors shall master the contents of the lessons and familiarise themselves with the instruments

SAFETY 4

The mortar and ammunition used can cause death or serious injuries to soldiers

It is important,

that methods described in this publication always be applied exactly as given

For safe use of the plotter,

refer also to B-GL-304-003/TS001 Operational Training,

Volume 3,

Ranges and Training Safety

Instruments for Calculating Mortar Firing Data

TABLE OF CONTENTS FOREWORD

I PREFACE Aim

MORTAR FIRE DATA CALCULATOR COMPONENTS OF THE MORTAR FIRE DATA CALCULATOR

Enabling Objective

THE MORTAR FIRE DATA CALCULATOR PROGRAM

Enabling Objective

PREPARE THE MORTAR FIRE DATA CALCULATOR FOR FIRING

Enabling Objective

B-GL-385-015/PT-001

LESSON 4

PRODUCE FIRE DATA FOR A SIMPLE FIRE MISSION

Enabling Objective

PREPARING THE MORTAR FIRE DATA CALCULATOR FOR SAFETY

Enabling Objective

CHANGE PROCEDURES I AND II

Enabling Objective

CANCELLATION PROCEDURES AND ADJUSTING AN ERRING MORTAR

Enabling Objective

Instruments for Calculating Mortar Fire

LESSON 8

PRODUCE FIRE CONTROL DATA WITH THE MORTAR FIRE DATA CALCULATOR (MFDC)

Enabling Objective

PRODUCE POLAR FIRE MISSION DATA

Enabling Objective

101 vii

B-GL-385-015/PT-001

Main Teaching Points

130 viii

Instruments for Calculating Mortar Fire

Conclusion

PLOTTER PREPARE THE PLOTTER FOR FIRING

Enabling Objective

BALLITIC FIRING TABLES CONTENTS AND USE

Enabling Objective

B-GL-385-015/PT-001

LESSON 3

THE PIVOT METHOD

Enabling Objective

ALTERNATIVE METHOD

Enabling Objective

CONVERGE FIRE MISSION

Enabling Objective

ADJUST AN ERRING MORTAR

Enabling Objective

ENGAGE TWO TARGETS AT THE SAME TIME

Enabling Objective

Instruments for Calculating Mortar Fire

Conduct of the Lesson

POLAR FIRE MISSION

Enabling Objective

ILLUMINATION MISSION

Enabling Objective

B-GL-385-015/PT-001

Main Teaching Points

Instruments for Calculating Mortar Firing Data

LIST OF FIGURES Figure 1-1: HP 41CV Calculator with Overlay

Instruments for Calculating Mortar Firing Data

CHAPTER 1 MORTAR FIRE DATA CALCULATOR LESSON 1 COMPONENTS OF THE MORTAR FIRE DATA CALCULATOR ENABLING OBJECTIVE 1

Produce fire control data with the Mortar Fire Data Calculator (MFDC)

MAIN TEACHING POINTS 2

Components of the MFDC: a

PREPARATION 3

Time Required

One 40-minute period

Theoretical and practical

Administration

Stores:

MFDC complete,

Training Aids: a

B-GL-385-015/PT-001

Instruments for Calculating Mortar Firing Data

CONDUCT OF THE LESSON 8

Introduction: a

As required

You will learn its components and how to maintain the MFDC

As a control post operator (CPO) you must know the components of the MFDC and how to maintain it

During the course,

Stage 1—Components: a

The primary means of producing fire and survey data for mortars is the Hewlett-Packard (HP) 41CV manually operated programmable calculator

It is more accurate and faster than manual plotters

its efficiency depends on operator skill

When the operator knows how to use the calculator and makes correct entries using proper procedures,

particularly when operating without a printer,

with no paper proof of calculator data

The MFDC consists of the following major components: (1)

HP 41CV Calculator

HHP-16K Erasable Programmable Read Only Memory (EPROM) Module

HP Printer

B-GL-385-015/PT-001

Mortar Fire Data Calculator

Confirmation of Stage I: a

Stage II—HP 41CV Calculator: a

The liquid crystal display shows up to 10 figures with decimal and ± indicators

It operates from 0º C to 45º C

The indicators across the bottom enable a quick check of calculator status

They light up when engaged

BAT—indicates batteries are low

USER—indicates calculator is electronically disengaged from the emulator and is in the calculator mode

GRAD/RAD—when the Erasable Programmable Read Only Memory (EPROM) is connected,

RAD is a function that does not apply at this time

SHIFT—indicates shift key pressed to use secondary key functions

they show the position of data calculated in the EPROM,

TGT I (target 1) or TGT II

PRGM—indicates that data is being calculated or withdrawn from EPROM

ALPHA—this is another mode indicator used to tell the user that these coloured letters or figures are being used

Accessory input/output ports are located at the top of the calculator

B-GL-385-015/PT-001

Instruments for Calculating Mortar Firing Data

Power is supplied by one or more of: (1)

four disposable batteries (Ever-ready E90 or Mallory MN 9100 type)

a 24 volt system using Inverter Power Statics

The battery holder or rechargeable battery pack is inserted into the rear of the calculator

The calculator must be turned off to do this

If any of the batteries are inserted incorrectly the calculator may not turn on

Figure 1-1: HP 41CV Calculator with Overlay

Confirmation of Stage II:

B-GL-385-015/PT-001

Mortar Fire Data Calculator

Stage III—Connecting Components: a

The HHP 16K EPROM module has three chips that contain the 81 mm mortar program

The program name,

modifications and date of chip production are marked on the exterior

Ensure the calculator is turned off and insert the connector only into port number 3

The printer is designed for use with the HP-41CV and provides a written copy of all data and functions

Ensure the calculator and printer are turned off before inserting the connector into port number 4

CAUTION

Always turn the MFDC off before connecting or disconnecting components

Failure to do so could damage both the calculator and the components

Figure 1-2: HHP-16K EPROM Module B-GL-385-015/PT-001

Instruments for Calculating Mortar Firing Data

Confirmation of Stage III: a

Stage IV—HP Printer Switches/Keys: a

“PRINT MODE”—there are three printing modes: “MANUAL”,

” The recommended mode is “NORMAL” and the auxiliary mode is “TRACE”

“PRINT INTENSITY”—five positions that control print quality

“PRINT”—prints specific contents in the system for non-81 mm mortar applications

For 81 mm mortar fire data,

the “ALPHA” function is used

“PAPER ADVANCE”—paper advances continuously until key is released

“POWER”—indicates power is on

“BATTERY”—indicates battery power is low with 10-15 minutes operating time left

“BATTERIES”—The rechargeable batteries supply power for sustained portable printing with time of operation dependent on battery condition

Ensure the printer is switched off and the AC adapter/recharger is disconnected prior to replacing batteries

Continued printing with the battery light on will damage the rechargeable batteries

Replacing the batteries: B-GL-385-015/PT-001

Mortar Fire Data Calculator

ensure printer is turned off and adapter is unplugged

push legs of battery holder toward the centre

place your hand over the opening,

and remove batteries and tongue

aligning them with springs in the compartment

insert door hinge in the battery compartment slot,

close the tongue and latch by pushing legs outwards

Confirmation of Stage IV: a

Stage V—Thermal Paper: a

This is a special heat-sensitive paper in 80-foot rolls

A blue marking appears as a warning that the end of the roll is near

The roll generally has enough paper left for finishing the mission

It is chemically treated on one side only

To load paper into the printer: (1)

Turn printer on,

open cover and remove the empty core from the paper well

Remove the first 2 turns from the new roll to ensure the paper is neither torn nor ragged

It is important that the leading edge is straight

Place the roll in the cover and push the leading edge into the slot at the bottom of the well,

B-GL-385-015/PT-001

Instruments for Calculating Mortar Firing Data

Press the paper advance key and hold down until the paper passes the top of the clear plastic tear-bar

Close the cover and press R/S or PRINT key

If it is feeding but not printing,

the paper is inverted and the roll must be reinserted

CAUTION

To avoid damage to the printer,

ensure that the charging unit is plugged into the printer before plugging in the adapter

Confirmation of Stage V: a

Stage VI—Accessories: a

Rechargeable Battery Charging Unit

This source of electricity enables using the calculator without plugging it in and the time available depends on the state of the batteries

Reserve Battery Charging Unit

When the power indicator light is on the unit is charging a battery

The unit will fully charge a printer battery in 14 to 16 hours

AC Re-charger Adapter

The above units are used to charge rechargeable batteries for the calculator and the printer

They can provide power to both components simultaneously

The universal plug fits the calculator,

printer and reserve battery charging unit

B-GL-385-015/PT-001

Mortar Fire Data Calculator

The Calculator can operate on 110 volts in Canada and 220 volts in Europe

Card Reader

This component will write or read data stored on magnetic cards

It plugs into port number 4 of the calculator

The card reader is used to transfer information quickly and will be dealt with in greater detail in a subsequent lesson

The printer must be disconnected when the card reader is in use

Blank Magnetic Cards with Holders

These cards are used to store information such as target lists

Care must be taken not to foul the surface with fingerprints,

A card designed to clean the card reader is provided

This subject will be covered in greater detail during the lesson on the card reader

Vinyl Case

The case is designed to protect the calculator when it is not in the travel case

Travel Case

All components are carried in an aluminium case with two locking latches and fitted foam interior

The travel case has a carrying handle and detachable shoulder strap

Figure 1-3: Accessories B-GL-385-015/PT-001

Instruments for Calculating Mortar Firing Data

Confirmation of Stage VI: a

Stage VII—Maintenance: a

Care and maintenance of the calculator

Recharge or replace batteries when the BAT indicator appears in the display

Protective cap should be placed on unused input or output ports so that no dust can penetrate and contaminate the terminals,

resulting in poor functioning of the instrument

The contact area of all plug-in extensions must be kept free of obstructions

The plug-in extensions may be cleaned by brushing or blowing dirt out of the contact area

Do not use any liquid to clean them

CAUTION

Be careful to avoid putting your fingers or any other object in any port

To do so could alter the continuous memory or damage the calculator

Only HP-41CV accessories are designed for plugging into the ports

Extensions must be stored in a clean,

Do not place plug-in extensions in a pocket unless they are protected

Static electricity could damage the extensions

To avoid damage to the calculator it must be turned off before inserting or removing any plug-in extension

B-GL-385-015/PT-001

Mortar Fire Data Calculator

Disposable batteries delivered with the calculator are not rechargeable,

only the battery pack can be recharged

All information put into the calculator can be retained for 30-60 seconds by ensuring that the calculator is shut off when removing the batteries or battery pack

This is intended to provide ample time to change the batteries

the calculator will not turn on,

immediately remove the battery holder

Check the batteries for correct polarity and re-insert the battery holder

The calculator cannot be damaged by incorrect polarity

When recharging the rechargeable battery pack,

allow 14 to 16 hours for a full charge

The battery pack should be fully discharged before recharging

BAT will appear on the display to indicate that state

Premature recharging greatly reduces overall battery life and can be avoided by carrying a set of disposable batteries in a battery holder

If this condition occurs during a fire mission,

the disposable batteries can be inserted quickly to maintain fire

The calculator is designed to withstand a number of disruptions

If a disruption does occur the most common symptom is a loss of keyboard control

To remedy that problem,

remove the battery pack and re-insert it immediately

That will reset the calculator without causing MEMORY LOST (unless the cause was serious enough to produce that condition)

If after several attempts the problem is not rectified,

Ensure batteries are fresh,

contacts are clean and properly installed,

and ensure that all connections are fully inserted

B-GL-385-015/PT-001

Instruments for Calculating Mortar Firing Data

Turn calculator off then back on

If there is no response continue as follows

Carry out the MEMORY LOST procedure

If it does not respond,

Remove batteries and allow the continuous memory to fully discharge for four to six hours

after reinstalling the batteries the display shows MEMORY LOST when the calculator is turned on,

the calculator has been cleared and is ready for use

If the calculator still does not respond,

Printer Care and Maintenance: a

Keep the contact area of the printer plug free of obstructions

Should the contact area become dirty,

carefully brush or blow the dirt out of it

Do not use any liquid to clean the printer contacts

As for the calculator,

store the printer in a clean dry place

CAUTION

Always ensure that the calculator and printer are turned off before connecting or disconnecting the printer plug

Failure to do so could damage both components

If the printer seems to be operating correctly except for printing,

Ensure that the printer is in normal mode

Ensure the printer and EPROM module plugs are inserted fully in the ports and that both printer and calculator are turned on

B-GL-385-015/PT-001

Mortar Fire Data Calculator

Check the power indicators on both the calculator and printer to ensure there is enough power

If either one has inadequate power,

Check the calculator display for “OUT OF PAPER” message

If the printer runs out of paper it will stop printing

Press PRINT then PAPER ADVANCE on the printer

If the paper advances,

the printer is operating correctly

If the paper is jammed,

clear it by grasping the tape and pulling it forward or backward through the mechanism

Never insert tools or other objects into the mechanism

If the problem persists,

connect the printer to another calculator and a different printer to your calculator to determine which device needs repair

Turn in the malfunctioning device for repair

Confirmation of Stage VII: a

Final Confirmation: a

CONCLUSION 25

During this lesson you have learned the components of the calculator

As a CPO you must know how the components operate and carry out necessary maintenance to effectively produce fire data

The next lesson will be … B-GL-385-015/PT-001

Instruments for Calculating Mortar Firing Data

LESSON 2 THE MORTAR FIRE DATA CALCULATOR PROGRAM ENABLING OBJECTIVE 1

Produce fire control data with the Mortar Fire Data Calculator (MFDC)

MAIN TEACHING POINTS 2

The MFDC program: a

determining program validity date

PREPARATION 3

Time Required

Two 40-minute periods

Theoretical and practical

Administration

Stores:

MFDC complete one per student

Training Aids: a

B-GL-385-015/PT-001

Mortar Fire Data Calculator

CONDUCT OF THE LESSON 8

Introduction: a

As required

You will learn the description and explanation for the 81 mm mortar program

As a future control post operator (CPO),

you will need to have the necessary knowledge to retrieve fire data for neutralising and/or destroying the objective

During dry training,

live firing and on the battlefield

Stage I—“MASTER CLEAR” Procedure: a

It is often necessary to clear the calculator’s memory of all data entered such as base plate positions,

To clear the memory,

Turn the MFDC off

Press and hold the CLEAR key (identified by the arrow pointing to the left)

Turn the MFDC on and release the CLEAR key

The MFDC will display “MASTER CLEAR”

All data entered into the MFDC by the user has been cleared

The mortar program in the EPROM module is retained and cannot be erased

B-GL-385-015/PT-001

Instruments for Calculating Mortar Firing Data

Confirmation of Stage I: a

Stage II—Identification of Key Functions: a

We shall now see what happens with each key when the calculator is attached to the 81 mm EPROM

This is important because if we wish to carry out an exact function,

we must press the appropriate key on the calculator

We can see the effect of the keys in the following two ways: (1)

Turn the calculator on and hold each key down

The function will appear in the display window

The second method is to have the MFDC print out each key location and its function

Proceed as follows: (a)

connect the EPROM module to the calculator (port 3)

connect the printer to the calculator (port 4)

turn the USER key on the calculator to OFF and press XEQ

press the ALPHA key to ON (shows “ALPHA” in display)

use the blue letters on the key pad and spell PRKEYS

B-GL-385-015/PT-001

Mortar Fire Data Calculator

press the ALPHA key to OFF (“ALPHA” leaves the displays)

the MFDC will now print the location and function of each key

A number shows the location of a key,

for example: 11 XROM “FM” indicates the first key in the higher row

There are eight rows of keys numbered 1 through 8 vertically and 1 through 4 or 5 horizontally

The printout of functions shows the following: NOTE When a minus sign appears the shift key must be pressed before the required key

B-GL-385-015/PT-001

Instruments for Calculating Mortar Firing Data

When printing out the functions,

it is very important to set the calculator to the USER position

Confirmation of Stage II: a

Stage III—Overlay Explanation: a

The MFDC has a removable plastic overlay that shows the operations for each specific key when the MFDC is attached to the mortar EPROM

When the function is written to the side of the key,

SHIFT must be pressed first,

“ON”—used to turn the MFDC on or off

Press for on then press again for off

“USER”—electronically disconnects the EPROM to perform calculator operations

It will show as an B-GL-385-015/PT-001

Mortar Fire Data Calculator

indicator when another instrument is connected to the calculator and disappears when the other instrument is disconnected

“PRGM”—shows in view window when using the program

“ALPHA”—used to spell out words using the blue letters on the MFDC and also appears as an indicator when switched on

“FM” (Fire Mission)—used to enter FMs into the MFDC

Two targets can be engaged at one time under this key

TGT 1 (Target 1) and TGT 2 produce fire data from FM data for the selected target

“TGC1” (Target Grid Corrections 1)—used to input target grid corrections into the MFDC as normally sent (Left,

Produces fire data after corrections are input for TGT 1

“LC1” (Laser Corrections 1)—used to input laser corrections under Polar Missions TGT 1

“DF1” (Distribution of Fire TGT 1)—used to input the distribution of fire to TGT 1,

HE (high explosive),

WP (white phosphorous),

Converge,

Circle,

B-GL-385-015/PT-001

Instruments for Calculating Mortar Firing Data

“NFZ” ( No Fire Zones) — used to input No Fire Areas and No Fire Lines

“PM” ( Polar Missions)—used to input Polar Missions

Two targets can be engaged at one time

“TGC2” (Target Grid Correction 2)—for correcting TGT 2

“LC2” (Laser Corrections 2)—used to input laser corrections for TGT 2

“DF2”—Distribution of fire for TGT 2

“COR GRID” (Corrected Grid)—used to gain 10 figure Corrected Grid of targets

“SHIFT” (gold colour)—enables using secondary functions found on the side of the calculator

for example: depress SHIFT and TNFM

“IN/OUT”—used to put mortars in and out of action,

for example if number 4 mortar is out,

data is not computed for that mortar

The loss of the mortar’s data is compensated for

B-GL-385-015/PT-001

Mortar Fire Data Calculator

ARCS OF FIRE,

ATTITUDE and SPREAD

“OPS” (Observation posts)—used to store up to 10 Observation Post locations in 6,

“TS” (Target Storage)—used to store up to 39 targets in 6,

“REG” (Registration)—used to adjust fire data

“DLT AMMO” (Delete Ammunition)—used to cancel ammunition

“CHS” (Change Sign)—used to enter minus signs used for target co-ordinate corrections or laser corrections and to put in left or drop corrections

“REC” (Record)—used to record targets in calculator memory

“ < ”—used to clear view window or to go back one figure at a time to correct errors

Remaining keys are assigned to ammunition types as indicated on an overlay

Press SHIFT to access

“R/S” ( Run/Stop)—used to impose a pause in the print-out during operations or to respond Yes or No to questions asked by MFDC

To answer Yes,

press any positive number first then R/S ,

B-GL-385-015/PT-001

Instruments for Calculating Mortar Firing Data

Confirmation of Stage III: a

Stage IV—Determining Program Validity Date: a

The mortar program stored in the EPROM module can be updated

there must be a means of verifying that the correct program is being used

There are two methods: (1)

The data and program are recorded on a plastic shield attached to the EPROM box and must match the current program data

If the plastic shield is missing,

the program EPROM module burn dates can be retrieved as follows: (a)

Turn MFDC off and disconnect the printer

Turn MFDC on

Press SHIFT and ENTER

“CAT” will appear on the viewer

In sequence,

rapidly press key number 2 and R/S

The date the program was burnt onto the chips will appear on the viewer,

for example the date for MODE is 22 Sep 1993

If keys 2 and R/S are not pressed quickly enough the date will remain on the screen for less than one second

B-GL-385-015/PT-001

Mortar Fire Data Calculator

Confirmation of Stage IV: a

Final Confirmation: a

CONCLUSION 20

During this lesson you have learned “MASTER CLEAR” procedure,

explanation for the overlay and program validity

During use of the calculator (MFDC),

you must know this and be able to operate the MFDC without the overlay,

should it become lost or damaged

The next lesson will be …

B-GL-385-015/PT-001

Instruments for Calculating Mortar Firing Data

LESSON 3 PREPARE THE MORTAR FIRE DATA CALCULATOR FOR FIRING ENABLING OBJECTIVE 1

Produce fire control data with the Mortar Fire Data Calculator (MFDC) MAIN TEACHING POINTS 2

Prepare the MFDC for firing: a

set up for a Quick Fire Mission

PREPARATION 3

Time Required

One 40-minute period

Theoretical and practical

Administration

Stores:

MFDC complete one per student

Training Aids: a

B-GL-385-015/PT-001

Mortar Fire Data Calculator

CONDUCT OF THE LESSON 8

Introduction: a

As required

Carry out MEMORY LOST procedure

You will learn to prepare your MFDC for quick fire missions by using attitude line and layout methods

During training and especially in battle,

the mortar platoon must occupy mortar positions in different types of situations and must be able to react quickly to all fire requests

As a control post operator (CPO) you must be competent in using the three methods for preparing your MFDC

During dry training,

Stage I—Set Up for Quick Fire Missions (Crash Action): a

In plotter operations,

the CPO is required to set up the plotter to correspond to CPO base plate positions and to follow a set method for calculating accurate fire data

The same applies to the MFDC

The CPO must carry out set up procedures before accurate fire data can be produced

The first drill in set up,

is for quick fire missions (FMs)

This drill enhances the ability to produce fire data quickly when engaging targets of opportunity

Using this procedure,

all data is based on the centre of the base plate position

This drill is particularly useful for crash action situations

The method is as follows: Turn the MFDC on using MEMORY LOST procedure

If you are using a printer,

Proceed as follows: B-GL-385-015/PT-001

Instruments for Calculating Mortar Firing Data

DISPLAY

SHIFT/ SET

REMARKS Will accept grid in 6,

“CHECK MET” CHECK MET is prompt only

Enter “BP GRID 6” 6 figure grid 004723

You can depart set up and go to FMs now

End of sequence

NOTE The “CHECK MET” display is a visual and audio reminder of meteorological conditions

Using the above procedure,

all data are based on the centre of the base plate position

Confirmation of Stage I: a

Stage II—Set Up Using Attitude Line: a

The attitude is the bearing from number 1 and number 4 mortars

Attitude provides greater accuracy when firing fire missions

The MFDC will prompt “ATTITUDE”

It will also prompt “SPREAD

it will plot 30 metres between mortars

If the spread is greater or less than 30 metres,

you enter the correct distance

B-GL-385-015/PT-001

Mortar Fire Data Calculator

NOTE The automatic 30 metres is called a default

Prepare MFDC using the following data

Carry out MEMORY LOST procedure:

BP GRID

010 731

DISPLAY

SHIFT/SET

Enter the number 6

Enter 6 figure grid 010731

010731 R/S

5700 R/S

REMARKS

Enter 5700 Normal 30 metres,

Confirmation of Stage II: a

Stage III—Set Up Using Layout: a

This procedure is used when mortars are set up in other than a straight line,

for example a dispersed gun position

It provides correct distribution of fire during fire missions

Enter the group centre as the BP GR (Base Plate,

Grid Reference),

then enter the bearing and the distance each mortar is from group centre

B-GL-385-015/PT-001

Instruments for Calculating Mortar Firing Data

The following example illustrates the set up using layout procedure

Carry out MEMORY LOST procedure then enter the following data:

BP GRID (GROUP SURVEY POINT (GSP)) 006 737 LAYOUT

Bearing

Distance

DISPLAY

SHIFT/ SET

Enter the number 6

Enter 6 figure grid 006737

3200 mils

3200 R/S

30 metres

4800 mils

4800 R/S

30 metres

6400 mils

6400 R/S

30 metres

1600 R/S

30 R/S d

REMARKS

“#4 BEARING” 1600 mils “DIST

Post-crash Action Procedures (quick fire missions)

The MFDC is extremely flexible

It is especially fast during crash action drills

The CPO,

does not interrupt the procedure

Once the crash action drill is complete,

and if the base plate position B-GL-385-015/PT-001

Mortar Fire Data Calculator

the complete set up procedure must be used to produce more accurate fire

Confirmation of Stage III: a

Final Confirmation: a

CONCLUSION 17

In this lesson you have seen how to prepare your MFDC for quick fire missions using attitude,

As CPO you must be able to carry out these operations using different methods,

so as to effectively and quickly engage any target

The next lesson will be …

B-GL-385-015/PT-001

Instruments for Calculating Mortar Firing Data

LESSON 4 PRODUCE FIRE DATA FOR A SIMPLE FIRE MISSION ENABLING OBJECTIVE 1

Produce fire control data with the Mortar Fire Data Calculator (MFDC)

MAIN TEACHING POINTS 2

Produce fire data for a simple fire mission: a

fire data for engagement of simple fire missions (FMs)

conversion of fire data from target grid corrections

fire data for circular fall of shot

fire data when smoke is used in adjust

fire data when HE is used in adjust

PREPARATION 3

Time Required

Two 40-minute periods

Theoretical and practical

Administration

Stores:

MFDC complete one per student

B-GL-385-015/PT-001

Mortar Fire Data Calculator

Training Aids: a

CONDUCT OF THE LESSON 8

Introduction: a

Review set up procedure:

BP GRID

004 723

30 metres

C 70 A1

You will learn how to produce fire data for engaging a target using HE and smoke rounds

As a control post operator (CPO) you must be able to produce all types of fire data because different types of ammunition can be used in adjust

You should be able to change ammunition and produce correct data to quickly engage a target

During the course,

Stage I—Fire Data for Engagement of Simple Fire Missions: a

The target data sent by the Fire Controller (FC) must be processed to produce the fire data required for the mortar to put rounds on or near the target

Although the procedure differs from the plotter,

the resulting information is the same

Producing initial fire data with the MFDC is quick and simple with its key-in procedure: FM 4 MOR GR 010737 DIR 5600 MG 3 RDS 3 AF B-GL-385-015/PT-001

Instruments for Calculating Mortar Firing Data

DISPLAY

REMARKS

FM can be fired under TGT 1 or 2

010737 R/S

“TGT 1 GRID 6” Note: Continues to prompt for 6 figures

Go SHIFT then the AMMO KEY

“CHG 3 NO 3 BNG 0422 ELEV 1238 RANGE 1522 TOF 29

Enter the adjusting mortar for example mortar number 3

The MFDC selects the most central “SLCT CHARGE

?” charge with elevation near 1100 mils (or enter charge required)

MFDC now prints Fire Data

NOTE If the operator has already selected an ammunition type for the target,

the MFDC then asks “FIRE DATA

If the operator presses R/S,

a prompt to select an ammunition type for the target will appear

If the operator responds YES,

the MFDC selects the best charge for the actual range and produces fire data

Confirmation of Stage I: a

B-GL-385-015/PT-001

Mortar Fire Data Calculator

Stage II—Conversion of Fire Data From Target Grid Correction: a

The MFDC has produced sufficient fire data to place mortar rounds in the target area

The adjustment procedures are designed to place rounds on the target

The key procedure uses the same target grid corrections as the plotter

Set up as follows:

BP GRID

103 765

FM 4 MOR

FIRE DATA

GR 097 754

DIR 3685

SECT DUG IN

R 1255 TOF 30

Corrections to target data for this exercise are: RIGHT 150,

ADD 400,

DROP 200,

ADD 100,

RIGHT 25

For training purposes do one correction at a time

DISPLAY

3685 R/S

REMARKS If target number 2 press TGC 2

If RIGHT,

If left,

enter correction the CHS (CHANGE SIGN) then R/S

If no correction R/S

For our example enter 150 RIGHT

B-GL-385-015/PT-001

Instruments for Calculating Mortar Firing Data

DISPLAY

REMARKS

150 R/S

If ADD enter correction and R/S

If DROP enter correction,

CHS then R/S,

Prints fire data then goes back to “TGC 1 R/L” c