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I got this book some time ago and recently got back to it.  The book
is subtitled
Using a Pocket Calculator and the author recommends the casio fx-115MS.
I purchased the same model about a year ago but was unable to figure out how
to use the device, partially due to a very poor manual but also due to
a reluctance
to mash around the keys.
Recently I came across this web tutorial on the calculator

http://faculty.ccc.edu/jnadas/graduate/CASIO.fx115ms.HTM

Which prompted me to try the formulas on page 34 of the book.  I am now
pleased with the calculator and also I recall it was inexpensive.
I won't go into all the details of entering coordinates but I am attaching
a text document on how to enter the formulas which has been lightly proofread.

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        -------------------------------------------------------------
        Usage of Casio fx-115MS to calculate Hc and Zc
          
        {- minus}   the black minus key
        {x times}   the black multiply/times key
        {% div }    the black divide key
        {SHIFT}     the brown SHIFT key at top left
        {ALPHA}     the red alpha key located next to shift
        {CALC}      the grey calc key  
                    if SHIFT is pressed first then it is the SOLVE =  key
                    or if ALPHA is pressed first then it is the = sign
                    when entering a stored equation
        {Ans}       press the black Ans key  this key stops the calculator
                    from recalculating new values so the result of 
                    operations can be stored in registers.

        Notes: 
                    When you see something like {ALPHA} A below 
                    It means press the {ALPHA} key followed by the
                    {CALC} key. The A is printed above the {CALC}    
                    key in red meaning press {ALPHA} first.
                    I chose not to use {ALPHA} {CALC} as it seemed
                    confusing and once the sequence of key presses
                    is understood is goes very quickly.
                    The same goes for {SHIFT} with the second key
                    the text in brown.

        -------------------------------------------------------------
        Altitude

          sin HC = sin Lat sin decl + cos Lat cos decl cos LHA
          Format       A       B                           C     calculator
          
          {sin} {ALPHA}  A {X times} {sin} {ALPHA}  B {+} 
          {cos} {ALPHA}  A {X times} {cos} {ALPHA}  B {X times} 
          {cos} {ALPHA}  C {ALPHA} {CALC} {ALPHA}  X {SHIFT} {CALC} 

          A?      value in A register  press the {=}  black key
          B?      value in B register  press the {=}  black key
          C?      value in C register  press the {=}  black key
          X?      {SHIFT} {CALC}

                  should display X=   sin Hc value  
          {Ans} {SHIFT} STO  Y     store value in Y
          {SHIFT} {sin} {ALPHA}  Y {=}
                  should display sin-1 Y   and  Hc value in degrees
          {SHIFT} STO  D     store value in D register

        -------------------------------------------------------------
        Azimuth
         
          cos angle Z = sin decl - (sin Lat sin Hc ) / ( cos Lat cos Hc )

          Zc = Z  if  180 deg < LHA < 260 deg
          Zc = 360 - Z  if  0 deg < LHA < 180 deg

          {sin} {ALPHA}  B {- minus} {(} {sin} {ALPHA}  A {X times}
          {sin} {ALPHA}  D {)} { % div} {(} {cos} {ALPHA}  A
          {X times} {cos} {ALPHA}  D {)} {ALPHA} {CALC} 
          {ALPHA}  X {SHIFT} {CALC} 
  
          A?      value in A register  press the {=}  black key
          B?      value in B register  press the {=}  black key
          C?      value in C register  press the {=}  black key
          X?      {SHIFT} {CALC}

          {SHIFT} {cos} {ALPHA}  Y {=}
                  should display cos-1 Y   and  Z value in degrees
          {SHIFT} STO  E     store value in E register

          Zc is calculated from given rules

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