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## A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

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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

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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