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    Casio fx-115ms calculator usage corrections
    From: J Cora
    Date: 2009 Apr 29, 07:32 -0700

    I was reviewing my attachment on how to use the casio fx-115MS
    calculator for sight reduction and found some errors.
    
    The calculator runs on solar power or backup battery
    Though it is not waterproof I think it could be used
    in a transparent zip bag.     It is available for 15 dollars us.
    You can even do log trig.   Degrees can be entered with decimal
    minutes, decimal minutes and seconds or as degrees, minutes and
    seconds so it is flexible.
    
    Also I just got a casio fx-115ES for 17 dollars us
    which has a larger display and better editing
    capabilities and will be working on some doc for it.
    
    However the display on the fx-115MS has black
    lcd text and the newer fx-115ES has blue text
    which is a bit harder to see.
    
    --~--~---------~--~----~------------~-------~--~----~
    Navigation List archive: www.fer3.com/arc
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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
                        {(-)} key. The A is printed above the {(-)}    
                        key in red meaning press {ALPHA} first.
                        I chose not to use {ALPHA} {(-)} as it seemed
                        confusing and once the sequence of key presses
                        is understood it goes very quickly.
                        The same goes for {SHIFT} with the second key's
                        text in brown.
    
            -------------------------------------------------------------
            Altitude
    
              sin HC = sin Lat sin decl + cos Lat cos decl cos LHA
              Format       A       B                           C     
              
              {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 )
    	  Format             B           A       D             A       D
    
              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}
    
    	  {Ans}
              {SHIFT} STO  Y     store value in Y
              {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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