# NavList:

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

Message:αβγ
Message:abc
 Add Images & Files Posting Code: Name: Email:
From: T Tom
Date: 1999 Mar 17, 22:38 EST

```Dan,
Thanks for the help now I get to learn how to actually make my calculator work,
now where did I put that  manual. This is also a sort of test post as I seem to
have a problem with my mail being cross posted
Talk to you again soon.
Tom
"Daniel K. Allen (Visual C++)" wrote:
> You can easily program in the sight reduction formula into an HP19BII or any
> other HP calculator with HP Solve.  This is, of course, just the law of
> cosines:
>
> Spherical Trig Law of Cosines
> cos(a)*cos(b) + sin(a)*sin(b)*cos(ab) = cos(c)
>
> and then you can use it to solve both great circle distance calculations and
> sight reduction by the following use of a, b, ab, and c:
>
> For Great Circle Distance Computations:
> a = 90 - lat1, b = 90 - lat2, ab = lon2 - lon1: c*60 = distance in nmi
> b = c, c = b, recalc and ab = inital course
>
> For Celestial Nav Sight Reduction:
> a = 90 - estLat, b = 90 - decl, ab = LHA = GHA - estLong, 90-c = altitude
> b = c, c = b, recalc, and ab = azimuth (360-az if lha < 180)
>
> Dan
>
> -----Original Message-----
> From: Titanium Tom [mailto:titom{at}XXX.XXX]
> Sent: Friday, March 12, 1999 7:29 PM
> To: Daniel K. Allen (Visual C++); Daniel K. Allen (Visual C++)
> Cc: 'Mike Wescott'; Dan Hogan; navigation{at}XXX.XXX
> Subject: Re: [Nml] Calculators for Navigation
>
> Dan,
> My calculator that I  presently use is an HP19BII,  Buisness  Consultant II
> which has RPN also.  Do you think that I will be able to use it for what I
> will
> need for our purposes here on Silicon Sea II ?
> Thanks for the help.
> T Tom.
>
> Daniel K. Allen (Visual C++) wrote:
>
> > Personally I prefer to spend my time doing lots of programming on my
> HP-48GX
> > to get sight reduction to the fewest keystrokes!  The HP 48 uses very
> little
> > power and has great built-in functionality.  It has a strange programming
> > language called RPL (Reverse Polish Lisp) but it is quite powerful.  Sadly
> > HP is doing very little with calculators any more.
> >
> > My best nav programs are written in the C programming language and run on
> my
> > laptops, although I am about to port them to a small HP620LX Windows CE
> > machine... which is what HP is putting its efforts to now.  At least these
> > machines can be programmed in C -- a big step forward -- but they do not
> > support much programming on the machine: you need to write the programs on
> a
> > desktop machine running Windows 98 or NT.
> >
> > I've begun experimenting with some nav software written as an Excel
> > spreadsheet, and it actually works quite well.  These Handheld PCs that
> run
> > Windows CE (like the HP620LX and their newer Jornada) have a Pocket Excel
> in
> > ROM and one CAN program on the handheld machine in Excel simply by writing
> > formulas.  (No macros or VBA yet though.)
> >
> > One of the great advantages of using Excel for numerical calculations is
> > that you can see as much of your intermediate results as you want along
> the
> > way.  You can change just one variable and see how it affects the answer,
> > etc.  Writing nav software using Excel is actually pretty promising!
> >
> > Dan
> > danallen{at}XXX.XXX
> >
> > -----Original Message-----
> > From: Mike Wescott [mailto:mike.wescott{at}XXX.XXX]
> > Sent: Friday, March 12, 1999 6:18 AM
> > To: Titanium Tom
> > Cc: Dan Hogan; navigation{at}XXX.XXX
> > Subject: Re: [Nml] Silicon Sea II: Show of Hands
> >
> > > What type of calculator is the best for working the calculations, should
> > it be
> > > programable?
> >
> > Personally, I prefer minimal computer help for doing the Silicon Sea
> > problems
> > (and maximal help on the open sea). I use a simple calculator and plotting
> > sheets. If I weren't too lazy to use an Ageton method (or one of it's
> > relatives,
> > I would do without the calculator.
> >
> > --
> >         -Mike Wescott
> >          mike.wescott{at}XXX.XXX
>
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-=
> =-=  TO UNSUBSCRIBE, send this message to majordomo{at}XXX.XXX:     =-=
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-=
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-=
=-=  TO UNSUBSCRIBE, send this message to majordomo{at}XXX.XXX:     =-=
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-=
```
Browse Files

Drop Files

### Join NavList

 Name: (please, no nicknames or handles) Email:
 Do you want to receive all group messages by email? Yes No
You can also join by posting. Your first on-topic post automatically makes you a member.

### Posting Code

Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.
 Email:

### Email Settings

 Posting Code:

### Custom Index

 Subject: Author: Start date: (yyyymm dd) End date: (yyyymm dd)