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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.
-
-
-