|
|
Subject: Re: Navigation Survey
From: Noyce, Bill (William.Noyce@XXX.XXX)
Date: Fri May 25 2001 - 15:29:42 EDT
Navigation-L Survey
I've been experimenting with a minimalist approach.
Tools are an orienteering compass (for protractor) and a pencil.
Plotting sheets are notebook paper.
Tables consist of the following 8.5x11 sheets:
One sheet trig tables. Front has log sec & log csc every
10' for angles 6 to 45 degrees, plus interpolation help;
back has log csc for every minute from 1' to 8 degrees,
plus log sec for every 10 minutes.
One sheet anti-log tables (100 lines of 10 entries
plus interpolation help).
One sheet sun almanac (Daily GHA & declination)
One sheet with star positions on front (considered good for
a whole year) and useful tables on back (Aries per month,
day, hour, minute; Dip, Refraction)
Six sheets of Moon positions every 4 hours I haven't had to use...
Recently added one sheet for each of Mars, Venus, Jupiter, Saturn
With a good time source, this should allow (slow) navigation that
is not significantly less precise than the sextant sights.
The theory for the moon positions is that they would allow setting
the time source...
a) Dead Reckoning
What is the method used most?
Mid-Latitude
b) Sight Reduction
Which is your primary Sight reduction method?
Computer Program(Name?)--------:
Calculator(Name?)--------------:
Short Navigation Tables,
H.O. 211 etc.(Name?)-------: Ageton's method, but with the
short
trig tables described above
Standard Navigation Tables,
229, 214 etc.(Name?)-------:
Other(Name?)-------------------:
c) Plotting
How do you do your plotting?
Computer Program(Name?)---:
Universal Plotting Sheets-:
Maneuvering Board----------:
Radar Plotting Sheets-----:
Home Made(Describe)-------: Notebook paper turned sideways, using
angled line to measure for latitude
lines
d) Navigation Manuals
Name your main reference manual-:
Bowditch, a mid-60's edition borrowed from a friend
(It's one thick volume but includes the tables)
Name a manual/book that helped you the most-:
Bowditch
e) Do you use the Nautical Almanac?
Commercial-:
USNO-------:
Computer-generated Almanac described above, checked with Henning
Umland's Sun/Moon calculator and USNO's Online Almanac
Dan Hogan WA6PBY
Catalina 27 "GACHA"
dhhogan@XXX.XXX
Navigation-L List Owner
http://www.wa6pby.com
|