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    BASNAV33 and other old freeware navigation software
    From: Jim Thompson
    Date: 2004 Mar 4, 08:18 -0400

    This might be old news to longterm list members, but it was new news to this
    A friend turned me on to BASNAV33, an old DOS program contained in a zip
    archive file with 3 other files. These programs apparently were written by a
    USPS celestial navigation person, Stanley L. Klein. They were written to
    help CN students check their hand reductions.
    "The following four files are included in archive (NAVSET33.ZIP):
    1) BASNAV33.EXE
    2) COSINE23.EXE
    3) NAVPLN31.EXE
    4) NAVSET33.TXT"
    I found the complete zip file at http://ftp.linux.org.uk/pub/Navigation/.
    See descriptions of the programs on that page at
    http://ftp.linux.org.uk/pub/Navigation/DIRECTORY, where there are a bunch of
    other free navigation programs too.
    I ran the program (BASNAV33) on one of my Caribbean sights. It gave a very
    different answer because the program does not allow me to specify ZD. The
    Dominican Republic uses ZD +4 (AST), but the program calculates ZD using
    longitude 68dW divided by 15d (ZD +5). So I got the right answer by tricking
    the program, entering WT one hour earlier than what I measured. Then I got
    the same answer as my hand reduction and CelestNav.
    Advantages of the program:
    - The program is handy for CN students because it follows the USPS SR-93
    form, obviously similar to our CPS SR-90 form. So they can enter their data
    the way they are used to.
    - The program makes it easy to enter repeat sights for the same DR position,
    date and time.
    Problems with the program:
    - It does not use exactly the same calculator formula for Hc. We use
    meridian angle for Hc, but it uses LHA. However the principle is close
    enough, and the answers are the same.
    - Cannot specify Time Zone (ZD).
    - The program does not print out its interim results, just Hc, Ho, LHA, a
    and Zn. But that alone is useful for CN students who are trying their own
    NAVPLN31 is nice for calculating solar phenomena in standard time zone
    areas, but it did not work for my Dominican Republic sights because I could
    not trick it around the time zone anomaly.
    Of course modern commercial programs like Navigator, PocketPC and others do
    all this in Windows more conveniently, but this set of programs is handy
    because it follows the CN protocols, and of course they are free.
    Jim Thompson
    Outgoing mail scanned by Norton Antivirus

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