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    Celestial Navigation Made Easy - by Francois Meyrier
    From: J Cora
    Date: 2009 Apr 24, 11:41 -0700

    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.
    
    --~--~---------~--~----~------------~-------~--~----~
    Navigation List archive: www.fer3.com/arc
    To post, email NavList@fer3.com
    To unsubscribe, email NavList-unsubscribe@fer3.com
    -~----------~----~----~----~------~----~------~--~---
    
    
    
    
    
    
    
    
            -------------------------------------------------------------
            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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