SURPAC
Surveying
Software
The
SURPAC MINING
Module
Applications

Underground Peg Calculation using the "Double Set Up"
Method

This
application is designed to solve the common underground Mine Survey problem of
determining and checking the [Y, X, Z] (or [E, N, Z]) ordinates a new
Peg. 

The
[Y, X, Z] (or [E, N, Z])
ordinates of both the Set Up Peg and the Back Sight peg must be known, and
exist in the current Coordinate File. 

This
technique provides a better overall check on the position of the New Peg
than does the "Double Button" technique described below. The
"Double Set Up' technique provides a full check on the distance
between the two Pegs, and their relative elevations. However, until
the Peg's position is verified by means of a closed traverse at some
future date, its absolute position can not be assured. 

The required method of Survey is a
Set up at the Set Up (or Fixing) Peg, plus a Setup at the New (or ForeSight) Peg. 

At the
Set Up Peg , the following quantities should be measured or observed :
Back Check Vertical Angles and Distance to the Back Sight Peg in order to verify the relative positions of these two Pegs, with respect to their theoretical values,
Face Left and Face Right Vertical Angles to the Fore Sight
Peg,
One,
or two, full Arcs (Face Left and Face Right) Horizontal Angles to the Fore Sight Peg and the Back Sight
Peg,
The Slope Distance to the Fore Sight Peg, measured from the Height of Collimation of the Instrument to the Bob at the Fore Sight
Peg,
The Height of Instrument (Collimation). If this value is measured from a Roof Peg, then the value must be entered as
negative, and
The Height of the Bob at the Fore Sight Peg. If this value is measured from a Roof Peg, then the value must be entered as positive.


At the Fore Sight Peg , the following quantities should be measured or observed :
Face Left and Face Right Vertical Angles to the
Set Up Peg,
The Slope Distance to the Fixing Peg, measured from the Height of Collimation of the Instrument to the Bob at the
Set Up Peg,
The Height of Instrument (Collimation). If this value is measured from a Roof Peg, then the value must be entered as
negative,
The Height of the Bob at the
Set Up Peg. If this value is measured from a Roof Peg, then the value must be entered as
positive, and
If required, the Roof to Floor Height
value may be measured.


The
application allows for data entry by :

Manual
(keyboard) entry of Observations, 

From
a pregenerated
ASCII File (type ***.pg1), or 

Automatic loading of the observations from a
SURPAC Observation File. 


Calculation will only take place if none
of the angular and/or linear measurements exceeds the User specified limits.
These limits are compared to the calculated differences for Vertical Angles, Horizontal Angles, Horizontal Distances and Vertical Height Differences.
They also provide the option of forcing the User to carry out a Back Check before the new Fore Sight Peg can be calculated.
The ability to modify these limits is limited to Users having the
necessary Security Code. This Security Code prevents unauthorized Users from changing the limits, or resetting the Back Check option. 

Before
the New Peg calculation takes place, a Back Check calculation may be
carried out to verify the relative positions of
the Back Sight Peg and the Set Up Peg against the theoretical values. 

After
calculation takes place, the Coordinates, Peg Elevation and Floor Elevation of the Fore Sight Peg (New
Peg) will be stored in the current Coordinate File. 

The results of the Peg calculation will also be stored in the MultiPolar/Peg File of the current Coordinate File. This file will hold and display up to 4 determinations of a
Peg, over and above the actual coordinates (current values) stored in the Coordinate File. Running the Edit a MultiPolar/Peg File (found under the General main Menu) programme will generate a display of a summary of all determinations of existing
Pegs in the Coordinate File. The stored ASCII file (type ***.pg1) can then be called, for any the Point/Peg determinations, which will
in turn generate a full display of all the observational and derived data for
the New Peg calculation. 

After
calculating the New Peg, an ASCII Peg
File (type ***.pg1)
of all observed and derived data my be created. This ASCII Peg file has four
main uses :
The results of the New Point just calculated can easily be imported back into
the application at any future time, preventing the time wasting and possible errors of reentering these data manually. Even if the observational data originally came from an Observation file, the ASCII file contains extended information relative to the Peg calculation.
When
doing a Right Button Click on a Point displayed in the Coordinate File,
for example, it is possible to display the contents of any ASCII Peg file relative to a required
Peg and to recalculate the Peg.
If
the User requires an output format different from the one used by
SURPAC, the data from the ASCII Peg file can be easily imported into a
User generated application.
It
provides a backup for all observational data used to fix the Peg.


The
application also allows for the calculation of a Chain length at the New
Peg. The Chain length is the height difference between the Peg elevation of the
New Peg and a computed Grade Elevation, based on User input information. 

The
option to Print the results is available, after the on screen entries have been made and
checked and the New Peg calculated. The results of both the Back Check
calculation and the Chain Length calculation may also be printed.

Underground
Peg Calculation using the "Double Button" Method

This
application is designed to solve the common underground Mine Survey problem of
determining and checking the [Y, X, Z] (or [E, N, Z]) ordinates a new
Peg. 

The
[Y, X, Z] (or [E, N, Z])
ordinates of both the Set Up Peg and the Back Sight peg must be known, and
exist in the current Coordinate File. 

Although
not as secure as the previously described "Double Set Up"
technique, this technique does provide a "semicheck" on the
distance between the two Pegs, and their relative elevations. Until the
Peg's position is verified by means of a closed traverse at some future
date, its absolute position can not be assured. 

The required method of Survey is a
Set up at the Set Up (or Fixing) Peg. 

At the
Set Up Peg , the following quantities should be measured or observed :
Back Check Vertical Angles and Distance to the Back Sight Peg in order to verify the relative positions of these two Pegs, with respect to their theoretical values,
Face
Left and Face Right Vertical Angles to the Fore Sight Peg, using two
different Button positions.
Up
to two full Arcs (Face Left and Face Right) Horizontal Angles to the
Fore Sight Peg and the Back Sight Peg.
The
Slope Distances to the New Peg, measured from the Height of
Collimation of the Instrument to both the Button positions at the
New Peg.
The
Height of Instrument (Collimation). If this value is measured from a
Roof Peg, then the value must be entered as negative.
The
Heights of the two Button positions at the New Peg. If these values
are measured from a Roof Peg, then the values must be entered as
positive.
If required, the Roof to Floor Height
value may be measured.


The
application allows for data entry by :

Manual
(keyboard) entry of Observations, 

From
a pregenerated
ASCII File (type ***.pg2), or 

Automatic loading of the observations from a
SURPAC Observation File. 


Calculation will only take place if none
of the angular and/ or linear measurements exceeds the User specified limits.
These limits are compared to the calculated differences for Vertical Angles, Horizontal Angles, Horizontal Distances and Vertical Height Differences.
They also provide the option of forcing the User to carry out a Back Check before the new Fore Sight Peg can be calculated.
The ability to modify these limits is limited to Users having the
necessary Security Code. This Security Code prevents unauthorized Users from changing the limits, or resetting the Back Check option. 

Before
the New Peg calculation takes place, a Back Check calculation may be
carried out to verify the relative positions of
the Back Sight Peg and the Set Up Peg against the theoretical values. 

After
calculation takes place, the Coordinates, Peg Elevation and Floor Elevation of the Fore Sight Peg (New
Peg) will be stored in the current Coordinate File. 

The results of the Peg calculation will also be stored in the MultiPolar/Peg File of the current Coordinate File. This file will hold and display up to 4 determinations of a Peg, over and above the actual coordinates (current values) stored in the Coordinate File. Running the Edit a MultiPolar/Peg File (found under the General main Menu) programme will generate a display of a summary of all determinations of existing
Pegs in the Coordinate File. The stored ASCII file (type ***.pg2) can then be called, for any the Point/Peg determinations, which will
in turn generate a full display of all the observational and derived data for
the New Peg calculation. 

After
calculating the New Peg, an ASCII
Peg file (type
***.pg2) of all observed and derived data my be created. This ASCII file
has four main uses :
The results of the New Point just calculated can easily be imported back into
the application at any future time, preventing the time wasting and possible errors of reentering these data manually. Even if the observational data originally came from an Observation file, the ASCII file contains extended information relative to the Peg calculation. When
doing a Right Button Click on a Point displayed in the Coordinate File,
for example, it is possible to display the contents of any ASCII Peg file relative to a required
Peg and to recalculate the Peg.
If
the User requires an output format different from the one used by
SURPAC, the data from the ASCII Peg file can be easily imported into a
User generated application.
It
provides a backup for all observational data used to fix the Peg.


The
application also allows for the calculation of a Chain length at the New
Peg. The Chain length is the height difference between the Peg elevation of the
New Peg and a computed Grade Elevation, based on User input information. 

The
option to Print the results is available, after the on screen entries have been made and
checked and the New Peg calculated. The results of both the Back Check
calculation and the Chain Length calculation may also be printed.

Underground
Peg Calculation using the "Double Back Fix" Method

The
programme is designed to handle a number of Peg Fixing and/or Checking for
the Mine Surveyor.


The
main difference between this programme and the previous Double SetUp and
Double Button Methods, is that the Peg to be fixed, or checked, is the
SetUp Peg itself.


This
programme can be used, for example, for the following :

Determining
the [Y, X, Z] values for any new Peg, from which two other fixed
Pegs can be seen. This method has the advantage that the Surveyor
can determine where he wants to put a new Peg, place the Peg, set up
under it and then fix the Peg (using this method), without having to
set up at any other Peg.


Checking
the [Y, X, Z] values for any existing Peg, from which two other
fixed Pegs can be seen. When checking an existing Peg, this method
provides a convenient and full technique for verifying the relative
positions of the SetUp Peg and the two sighted, Back Pegs.


Calculating
the [Y, X, Z] values for a Peg on a new Inter connected by a Raise
to a lower Inter. This method fixes the new Peg from twin Pegs
established over the Raise and whose plumb lines can be sighted from
both Inters (the Twin Raise solution). The plumb line Pegs
themselves are fixed from existing Pegs on the lower Inter. The
three Pegs on the upper Inter can either be in a straight line, or
can form the apices of a triangle. When using this option, the
following procedure should be followed :

On
the new Inter set two new Pegs such that their plumb lines can
be lowered down through the Raise, to be visible from the
lower Inter, containing the existing Pegs. These plumb line
Pegs should be set as far apart as possible, to provide the
best orientation accuracy. Place two buttons on each of these
plumb lines to be visible from the new Inter.


Establish
a new Peg to be used as the first SetUp Peg on the new Inter.
Setup under this Peg and use the Double Back Fix method to
obtain fixing data for this (new) SetUp Peg. If required, the
two plumb lines and the SetUp Peg may be placed in a straight
line, but this is not essential. A well conditioned triangle
(approximately equilateral) should, mathematically, provide
the best result.


On
the lower Inter, change the buttons on the two plumb lines so
that they are visible, setup at the nearest fixed Peg to the
two plumb lines, and then observe/measure data for fixing both
the plumb lines (and hence their two respective Pegs) by means
of the Double Button method.


When
calculating, first use the Double Button programme to
calculate the two plumb line Pegs from the setup at the fixed
Peg on the lower Inter. Then use this Double Back Fix
application to calculate the new SetUp Peg on the upper
Inter, and also to determine the orientations from this Peg to
the two plumb line Pegs. 


The
programme provides for full double Arc measurements for both Horizontal
and Vertical angles, and for double Buttons and double measurements for
each sighted Peg. Users can either use these full observation and
measurement options, or restrict the survey to a single Horizontal and
Vertical Arc, the use of single Buttons and single Distance measurements
to the sighted Pegs.


The
principle of the programme is relatively simple. It is based on the
determination of Directions (or Bearings) plus a base distance comparison,
using the “two sides and the included angle” technique for any three
Pegs representing the apices of a triangle. The programme is also able to
handle the situation where the three Pegs are in a straight line.


The
Height of the calculated SetUp Peg is determined by Trigonometrical
Heighting from observations taken to buttons (or bobs) suspended from the
two sighted Pegs. For best results, the double buttons should be observed
at each sighted Peg. 

The
required method of Survey is a Setup at the Peg to be fixed, or checked.


At
this SetUp Peg, the following quantities should be measured and/or
observed :

Face
Left and Face Right Vertical Angles to the Top and Bottom Buttons at
both Back Pegs.


Up
to two full Arcs (Face Left and Face Right) Horizontal Angles to
both Back Pegs.


The
Slope Distances to both Back Pegs, measured from the Height of
Collimation of the Instrument to the Top and Bottom Buttons at each
Back Peg.


The
Height of Instrument (Collimation). If this value is measured from a
Roof Peg, then the value must be entered as negative.


The
Height of the two Buttons at both the Back Pegs. If these values are
measured from a Roof Peg, then the values must be entered as positive.



The
application allows for data entry by :

Manual
(keyboard) entry of Observations, 

From
a pregenerated
ASCII File (type ***.pg3), or 

Automatic loading of the observations from a
SURPAC Observation File. 


Calculation will only take place if none
of the angular and/ or linear measurements exceeds the User specified limits.
These limits are compared to the calculated differences for Vertical Angles, Horizontal Angles, Horizontal Distances and Vertical Height Differences.
The ability to modify these limits is limited to Users having the
necessary Security Code. This Security Code prevents unauthorized Users from changing the
limits. 

After
calculation takes place, the Coordinates and Peg Elevation of the SetUp Peg (New
Peg) will be stored in the current Coordinate File. 

The results of the Peg calculation will also be stored in the MultiPolar/Peg File of the current Coordinate File. This file will hold and display up to 4 determinations of a Peg, over and above the actual coordinates (current values) stored in the Coordinate File. Running the Edit a MultiPolar/Peg File (found under the General main Menu) programme will generate a display of a summary of all determinations of existing
Pegs in the Coordinate File. The stored ASCII file (type ***.pg3) can then be called, for any the Point/Peg determinations, which will
in turn generate a full display of all the observational and derived data for
the New Peg calculation. 

After
calculating the SetUp Peg, an ASCII file (type
***.pg3) of all observed and derived data my be created. This ASCII file
has four main uses :
The results of the New Point just calculated can easily be imported back into
the application at any future time, preventing the time wasting and possible errors of reentering these data manually. Even if the observational data originally came from an Observation file, the ASCII
Peg file contains extended information relative to the Peg calculation.
When
doing a Right Button Click on a Point displayed in the Coordinate File,
for example, it is possible to display the contents of any ASCII Peg file relative to a required
Peg and to recalculate the Peg.
If
the User requires an output format different from the one used by
SURPAC, the data from the ASCII Peg file can be easily imported into a
User generated application.
It
provides a backup for all observational data used to fix the Peg.

The
option to Print the results is available, after the on screen entries have been made and
checked and the New Peg calculated.

Recalling, Viewing and ReUsing Peg ASCII Files for a Peg ReCalculation

This
function allows Users to recall any SURPAC ASCII Peg File for the purpose of
:

Viewing
its contents, 

Pasting
the contents to the Windows Clipboard (for use in other applications), 

Calling
the appropriate SURPAC Peg application and loading the necessary
calculation information from the ASCII File, ready for recalculation. 


This
function may be called in the following ways :
By
selecting the appropriate menu item from the "Mining" Main
menu heading. In this case, all the available ASCII Peg Files will be
displayed for selection. All ASCII Peg File types will be displayed,
i.e. ***.PG1 for double Set Up Fixes, ***.PG2 for Double Button Fixes
and ***.PG3 for Double Back Fixes.
By
doing a Right Button Click on a Point displayed in the Coordinate File
(when running the Coordinate File Editing application). If the clicked
Point has any associated ASCII Peg Files, the displayed popup menu will
provide an item that, when clicked, will display all Peg ASCII files
associated with the clicked Point, and allow selection of these Files. All
ASCII Peg File types will be displayed, i.e. ***.PG1 for double Set Up
Fixes, ***.PG2 for Double Button Fixes and ***.PG3 for Double Back
Fixes.
By
running the "Editing a MultiPolar/Peg File" application,
which is found under the "General" Main menu heading. When
viewing the contents of a MultiPolar/Peg File, this application allows
for the display of any associated ASCII Peg Files for a clicked Point,
and allow selection of these Files. All
ASCII Peg File types will be displayed, i.e. ***.PG1 for double Set Up
Fixes, ***.PG2 for Double Button Fixes and ***.PG3 for Double Back
Fixes.

Offset
Surveys (Bord and Pillar) Technique

This
application provides for the calculation and plotting of Offset data, for a conventional offset survey. 

The basis of the calculation is
:

a Control Line defined by an existing Back Sight Peg and an existing Fore Sight Peg. 

OffSet Pegs are
calculated from these two Control Line Pegs. 

These OffSet Pegs represent the terminal positions of the various OffSet Lines. 

Offset information between these OffSet Pegs, and the Control Line if required, is then entered. 


Input of the above data is either done manually, or from an OffSet ASCII file. 

The
application also calculates the Safety Factor of the pillars by means of the Squat Pillar formula . 

Quantities such as the mean bord width and average height of workings are computed from data input. 

The output consists of a plot of the Control and Offset beacons used, as well as the pillar sides running parallel to the offset lines. 

The tonnage, extracted area and the percentage of total area are also computed. 

Output of the OffSet information may be
to :
the Current Printer/Plotter which may be of A3 or A4 size,
an HPGL file or,
a DXF file, in 2D or 3D format.
a
SURPAC OffSet ASCII file. These files must be in the SURPAC "OSF"
format.

OffSets from an Observation File

This
application first computes coordinate values for Points that have been surveyed using a horizontal Offset Rod.
It is designed to compute values for Points at which a reflecting prism cannot be directly positioned, due either to the location of the Points, or to the nature of the Points (e.g. the corners of pillars, centres of trees etc.) 

Observations and distances are taken to a Prism on the Offset Rod. The distance from this prism to the end of the Offset Rod that is held at the actual Point (the Offset distance) must be kept fixed for reductions at a given
Set Up. The programme will compensate for the Offset distance, using one of two
field
methods, namely :

First, the Offset Rod used may be aligned so that it is always held perpendicular to the observer's line of sight, 

or
it may be held so as always to be perpendicular to a defined Base Line. 


The observations made to fix the SetUp Station and to determine the coordinates of the Offset Points must be held in a General Observation File. 

The
application will use any two User identified, Fixed Points as the terminals of a Base Line. Theses terminals will be used to coordinate the SetUp Station, as well as to define the Base Line Direction. 

The
Set Up "Station" may be at any, arbitrary position. The
application will determine the Set Up Station coordinates from appropriate observational data in the
defined Observation File. 

Both the Base Line terminals must be observed and measured from the SetUp Station. If one of the Base Line terminals has a zero, or nonmeasured distance, then the programme will assume that the
Set Up Station is at this terminal. 

Any number of different SetUps may be accommodated in a single Observation File. 

For
orientation at the Set Up Station :
the First Base Line terminal may be sighted a second time,
or
exterior
Orientations may be taken.

Pillar Safety Factor Calculations

This
application is designed to calculate the Safety Factor for a pillar, employing a number of options, namely :

Pillars may be defined as
:

Square , or 

irregular . 


The Pillar Type may be defined as being
:

Squat Pillar, or 

Conventional . 


If the pillars are defined as being Irregular then, for any mining depths, the user has a choice between
:

the Wagner
formula, or 

the Salamon
formula. 



Output
is to the Printer, an ASCII file or the Windows Clipboard. 
Gyro Theodolite Calibrations

This
application computes the Azimuth of the Indicated True North of a GyroTheodolite . 

The
following is a brief
explanation of conventions used :
A Great Circle is any circumference of the
reference Ellipsoid which contains the centre of the Ellipsoid. The Equator and all lines of Longitude are Great Circles.
The Azimuth at any given Point on the Ellipsoid represents the Direction of the portion of the Great Circle passing through the given Point and the Northern Pole of the axis of the rotation of the earth.
True North is the Direction of the portion of the Great Circle passing through the Origin (Central Meridian) of the Gauss Conform System in which the given Point is
determined, and the Northern Pole of the axis of rotation of the earth.
All Points in a given Gauss Conform System
("Lo" or "WG" System) will have the same True North. By convention in Southern Africa, True North is given a Direction, or Bearing, of 180 degrees.
Meridian Converge is the angular difference between True North and the Azimuth (plus 180 degrees) at any given Point. To obtain the True North at a given Point when the Azimuth is known, the Meridian Convergence is given the same Sign as the Sign of the Point's Y Coordinate.


The
application provides for calibration of a GyroTheodolite by using either
the Transit Method, or the Schuler Means method.

Using
the Transit Method
:

First,
the names of the Set Up Beacon and Reference Beacon are
entered, as well as the Observed Bearing to the Reference
Beacon . 

The
application will then compute and display the " Lo",
or "WG" Bearing to the Reference, plus the Meridian Convergence . 

Readings
are separated into Left Readings and Right Readings. 

The Time and Amplitude
are entered for each Reading. From these, the Swing, Time
Difference and the Mean Amplitude are computed. 

Editing
functions consist of :
Deleting a Line.
Inserting a Line.
Adding
a Line
Modifying
a Line


In order to compute the Constant of Proportionality and the Azimuth of the Gyro Indicated North, the
application requires that both Left Reading and Right Reading data sets are entered. 

After completing the entry of both the Left Reading and Right Reading
information, the application will calculate the :

Mean
Time Difference and Standard Deviation, 

Mean
Amplitude and Standard Deviation, 

Mean GyroTheodolite Reading , 

the Constant of Proportionality, 

the Mean Gyro Angle to Reference, 

the Bearing of the Gyro Indicated North, and 

the Azimuth of the Gyro Indicated North . 


Making further entries will cause the above results to be modified as the new data are taken into 

Output
may be to the Current Printer an ASCII file or the Windows
Clipboard . 


Using
the Schuler Means
(or Turning Point) Method
:

First,
the names of the Set Up Beacon and Reference Beacon are
entered, as well as the Observed Bearing to the Reference
Beacon. 

The
application will then compute and display the "Lo",
or "WG" Bearing to the Reference, plus the Meridian Convergence. 

The
"West Readings" and "East Readings"
for each observation line are entered. As
these entries are made, the application will calculate the Schuler Means. 

Once you have entered at least two pairs of readings, the
application will also calculate the :

Mean GyroTheodolite Reading, 

the Standard Deviation, 

the Mean Gyro Angle to Reference, 

the Bearing of the Gyro Indicated North, and 

the Azimuth of the Gyro Indicated North . 


Making further entries will cause the above results to be modified as the new data are taken into consideration. 

Editing
functions consist of :
Deleting any Pair of
readings,
Deleting a Schuler Mean,
Inserting a Pair of
readings,
Editing an
entered Reading.


Output
may be to the Current Printer an ASCII file or the Windows
Clipboard. 


Gyro Theodolite Bearing Reductions

This
application computes the Azimuth of the Indicated True North of a GyroTheodolite . 

For
an explanation of conventions used refer to the previous topic 

The
application allows for determination of the Gauss Conform, "Lo"
or "WG", Bearing of a defined Line from a GyroTheodolite by using either the Transit Method or the Schuler Means (or Turning Point) Method .

Using the
Transit Method
:

First,
the names of the Set Up Beacon and Reference Beacon are
entered, as well as the Observed Bearing to the Reference
Beacon . 

The
Constant of Proportionality and Theodolite Setting (N1') must
also be entered. 

The
application will then compute and display the " Lo",
or "WG" Bearing to the Reference, plus the Meridian Convergence . 

Readings
are separated into Left Readings and Right Readings. 

The Time and Amplitude
are entered for each Reading. From these, the Swing , Time
Difference and the Mean Amplitude are computed. 

Editing
functions consist of :
Deleting a Line.
Inserting a Line.
Adding
a Line
Modifying
a Line


In order to compute the Constant of Proportionality and the Azimuth of the Gyro Indicated North, the
application requires that both Left Reading and Right Reading data sets are entered. 

After completing the entry of both the Left Reading and Right Reading
information, the application will calculate the :

Mean
Time Difference and Standard Deviation, 

Mean
Amplitude and Standard Deviation, 

Mean GyroTheodolite Reading , 

the Constant of Proportionality , 

the Mean Gyro Angle to Reference, 

the Azimuth to the Reference, and 

the
"Lo" or "WG" Bearing to the
Reference. 


Making further entries will cause the above results to be modified as the new data are taken into 

Output
may be to the Current Printer an ASCII file or the Windows
Clipboard . 


Using the
Schuler Means (or Turning Point) Method
:

First,
the names of the Set Up Beacon and Reference Beacon are entered
and the Meridian Convergence calculated. 

Then
the Observed Bearing to the Reference Beacon and the Azimuth of the Gyro Indicated North
are entered. This last value must be obtained from a Calibration calculation using the defined GyroTheodolite. 

The
" West Readings" and " East Readings"
for each observation line are entered. As
these entries are made, the application will calculate the Schuler Means. 

Once you have entered at least two pairs of readings, the
application will also calculate the :

Mean GyroTheodolite Reading , 

the Standard Deviation , 

the Mean Gyro Angle to Reference 

the Bearing of the Gyro Indicated North, 

the Azimuth to the Reference, and 

the
"Lo" or "WG" Bearing to the Reference. 


Making further entries will cause the above results to be modified as the new data are taken into consideration. 

Editing
functions consist of :
Deleting any Pair of
readings,
Deleting a Schuler Mean,
Inserting a Pair of
readings,
Editing an
entered Reading.


Output
may be to the Current Printer an ASCII file or the Windows
Clipboard . 


