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Subject: Re: Hi (WAS: RE: ping)
From: Hal Mueller (hal@XXX.XXX)
Date: Thu Jan 25 2001 - 21:52:28 EST
At 4:18 PM -0800 1/25/01, Yves Arrouye wrote:
>So I'm now looking for 1/ good references to
>algorithms (Jean Meeus?), and 2/ suggestions on what you would like to see
>in a celestial navigation program that existing programs do not have.
When I was developing CelestNav and MG229, I used Jean Meeus
"Astronomical Algorithms" for the planetary ephemeris, the Nautical
Almanac itself for most of the sight reduction algorithms (with some
help from the hardcopy HO229), Bowditch for the geodesy formulas, and
the program MICA (from the US Naval Observatory) for checking
ephemeris calculations. Most of those references can be purchased
from Willman-Bell. Early versions of CelestNav used the PD code
NOVAS (also from the USNO) to do the star ephemeris, but most of that
code is gone now.
The most-requested feature enhancements from CelestNav customers are
support for artificial horizons, and sight planning tools (predict
the azi/elev of visible bodies from your DR position).
In addition to my own apps (CelestNav and MG229), I'm aware of
Astronavigation 2, and Pilot Navigator 3.1. All 4 are available at
http://www.palmgear.com/software/answer.cfm?categoryIDs=126%2C.
On the Palm side, if you decide to code in C I suggest you get up to
speed on multisegment applications, as well as learning the launch
codes and user interface guidelines thoroughly. There are other
options besides C now: AppForge's port of Visual Basic, NSBasic,
Satellite Forms, CASL, and others I've skipped. They're all listed
on www.palmos.com/dev.
The Palm OS Emulator is an essential tool. If you are outside of the
US, sign up right now for the developer program so that you can have
access to the device ROMs (there's an annoying delay between signup
and access). Start your Gremlins testing on POSE right away; don't
wait until your code is finished.
Regards,
Hal
---- Hal Mueller hal@XXX.XXX Mobile Geographics LLC http://www.mobilegeographics.com/ Seattle, Washington (206) 297-9575
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