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Hello All
I also have and used the hp41C with the Nav pac for many years. However it
wasn't until about 4 years ago on a voyage from New Zealand to Fort
Lauderdale that I discovered there is a problem in the nav pac chip. In a
word, it , say pgr. "Great Circle Plot" it will not handle the change (will
not compute) from Long W to Long E.***

As a matter of interest the hp users group have emulated this calc. along
with the Nav pac (and others) such that it runs on a PC (xp and Vista etc.)
*** Needless to say this problem was not corrected.Very nice but of course
slow...
If needs be I will post the web site...

Irvin F Haworth
West Vancouver BC
Canada
-----Original Message-----
From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf
Of FJones
Sent: June 7, 2008 11:34 AM
To: Anabasis; NavList@fer3.com
Subject: [NavList 5361] Re: Navigation Calculators


I still have my old HP-41CV general purpose calculator, including the
Navigation plug-in.  It was slow by today's standards but it was probably
the first self-contained almanac/celestial computer to hit the marketplace.
I have forgotten the various functions in the plug- in but it handled
great-circle calculations, star identification and more.  Many of you may be
familiar with it.  Now, if I could only remember where I last saw it . . .

Frank J.
Rochester, NY

Date sent:          Sat, 7 Jun 2008 01:36:12 -0700 (PDT)
Subject:            [NavList 5358] Navigation Calculators
From:               Anabasis 
To:                 NavList 
Send reply to:      NavList@fer3.com

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Does anyone on the list use navigation calculators?  If so, which model?

I use this one:

http://www.xnumber.com/xnumber/photo_tamaya_nc2.htm

It's nearly as old as I am and has no built-in Almanac like the NC-77 does.
It does Celestial triangles, trig functions, and sailings.  I use it daily
at sea to check speed made good on the hour.  I have also used it to reduce
sights (like a portable HO 229 etc).  I was given it a few years ago by a
retired Naval Captain who used it on his sailboat in the 1970's.  I do like
how I can see it "think" for every calculation.  A sailing takes a number of
seconds, and the navigation triangles even longer.

Out here the favorite among many is the now discontinued CelestComp IV, but
the parts are becoming scarce, so I don't think they will be around too much
longer here at sea.  Besides, most people are now using the bridge computer
with navigation programs now.

Jeremy






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