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    HP Calculators
    From: Dan Allen
    Date: 2001 May 30, 5:39 PM

    I think you mean HP49G vs HP48G.  I have several of each.  I did consulting
    for HP on the first HP48SX done back in 1991.  Here's the short summary:
    
    HP-49G - great symbolic math, but unfortunately at the expense of numeric
    computation.
    
    HP-48G - the best numeric calculator ever, with some symbolics
    
    HP-48G+ - same as 48G, but with more built-in memory - this is the Best Buy
    of the bunch
    
    HP-48GX - same as HP-48G+ but also with a card slot for plugging in
    software.  (Some on this newsgroup have mentioned, for example, that Tom
    Metcalf has a celestial nav card available for the HP-48GX.)
    
    I would recommend the HP-48G+ or GX if you want to spend the extra money and
    think you may buy canned celestial navigation software.
    
    I have written my own celestial navigation software for my HP-48s and it is
    great for that, but the programming language does take some getting used to.
    It is called RPL for Reverse Polish Lisp, a blend of their earlier RPN
    (Reverse Polish Notation) and Lisp.  RPL is pretty slick, but it is not a
    fast machine.  The tradeoff is that it runs on 3 AAA batteries for almost a
    year of use.  The G+ and GX models have 128KB of RAM and can hook up to a
    Mac or PC and I also use mine as a PIM (Personal Information Manager) to
    store phone numbers and such.
    
    With the 128 KB models there is enough memory for me to have a database of a
    1000 different locations that I can use for calculating distances, doing
    route planning, etc.  I create the database on a PC or Mac (I use both) and
    then download it into the HP-48.
    
    The HP-49G is their newest machine.  It is great for someone learning
    algrebra and calculus, and in theory it is a strict superset of the HP-48s,
    but there are just enough things oriented toward symbolics as to make it not
    near as handy for navigation software as the HP-48 series.
    
    For tons of free downloadable software, as well as HP calculator emulators
    that run on PCs, see www.hpcalc.org, an excellent website.
    
    Dan
    
    -----Original Message-----
    From  Navigation Mailing List
    [mailto:NAVIGATION-L{at}LISTSERV.WEBKAHUNA.COM]On Behalf Of Aubrey
    O'Callaghan
    Sent: Wednesday, May 30, 2001 3:57 PM
    To: NAVIGATION-L{at}LISTSERV.WEBKAHUNA.COM
    Subject: HP 59 calculator
    
    
    I am thinking of buying a HP59 for engineering use and also for astro
    navigation.
    Any comments from the group.
    Is this a wise decision or should I stick with the HP48GX ?
    Thanks,
    Aubrey.
    

       
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