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    Re: Calculators for Navigation
    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
    >
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