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1989-08-19
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NAVIGATION PAC
Copyright Celestial Software 1982 - 1989
This abbreviated version of the documentation will give the user
enough information to run the programs, and make a decision if he
wants to send in the $10.00 registration fee. When you register,
you will receive the printed manual, which is 15 pages and goes
into more detail. It has example problems like the one below for
Dead Reckoning.
GREAT CIRCLE SAILING
The shortest distance between two points on the surface of the
earth is called a great circle. For distances of less than 300
miles, the great circle route offers no practical advantage over
the rhumb line route.
RHUMB LINE SAILING
If a straight line is drawn between two points on a Mercator chart
it is called a rhumb line. Charts with Mercator projection are the
type most widely used by mariners. There is some distortion with
a Mercator chart. Nevertheless, for distances of 600 miles or less,
rhumb line sailing is very practical. The advantage with rhumb
line sailing is that the course doesn't change between the two
points. With great-circle sailing, the course is constantly
changing.
DEAD RECKONING
By advancing the vessel's previous position for course and
distance, the result is the dead reckoning position. No need for
parallel rules and dividers when you do dead reckoning by computer!
=================================================================
EXAMPLE:
From a starting position of 28 degrees 12 minutes North latitude
and 82 degrees 54 minutes West longitude, a vessel travels 35.8
nautical miles in a direction of 350 degrees true. What is the
vessel's DR position?
Starting Latitude? 28.12 <ENTER>
Starting Longitude? 82.54 <ENTER>
Distance Traveled? 35.8 <ENTER>
Course? 350 <ENTER>
Note that distance is always in nautical miles in marine
navigation.
OUTPUT:
Latitude
NORTH 28 DEGREES 47.3 MINUTES
LONGITUDE
WEST 83 DEGREES 1.1 MINUTES
=================================================================
LATITUDE BY NOON SIGHT
HO is the corrected sextant reading. HO stands for height
observed. DR Latitude is your dead reckoning latitude.
Declination of the sun comes from The Nautical Almanac or similar
almanac.
LONGITUDE BY TIME SIGHT
The time sight for finding longitude should only be used when the
celestial body is bearing nearly East or West. Also, the time
sight is dependent on a fairly accurate knowledge of the ship's
latitude.
The declination and GHA come from The Nautical Almanac.
STAR AND PLANET IDENTIFICATION
This program will help identify those difficult celestial bodies.
HO is the corrected sextant reading, ZN is the body's true azimuth
(use a hand bearing compass to get azimuth), GHA of Aries is found
in The Nautical Almanac. It should be understood that the output
will be the approximate declination and Sidereal Hour Angle (SHA)
of the body. One then looks in The Nautical Almanac (left hand
page) and determines which body has figures that come closest to
the computed declination and SHA.
SIGHT REDUCTION
This program replaces the popular sight reduction tables such as
H.O. 249 and H.O. 229. The navigator can use his dead reckoning
position as his assumed position. Sun, stars, moon, and planets
can be reduced with this program.
note:
GHA of star = GHA of Aries + SHA of star
To register your copy of NAVIGATION PAC send $10.00 in check or
money order to:
Celestial Software
114 Valencia Dr.
New Port Richey, FL 34652
(813) 845-8522
We can also accept Visa and Mastercard.
Upon registering, you will be sent a 15 page manual with sample problems.
Celestial Software also has a commercial product called NAVIGATION PAC PLUS.
It has built in almanac data for the sun and 57 stars until the year 2000.
It contains the following programs: 1. Sun & Star Reduction, 2. Sight
Reduction (all bodies), 3. Two body fix, 4. Dead Reckoning, 5. Great Circle
sailing, 6. Rhumb Line sailing, 7. Location of 57 stars, 8. Star
Identification. The price for Navigation Pac Plus is $41.95 postpaid.
It is available for IBM PC and compatibles (5 1/4" or 3 1/2") disks, Apple
IIe/IIc (5 1/4" disk), Apple Macintosh (3 1/2" disk), Commodore 64 (5 1/4"
disk). The price for Navigation Pac Plus is $41.95 postpaid for all
computers.