(Comp.sys.handhelds)
Item: 3382 by anderson at truebalt.caltech.edu
Author: [Eric R. Anderson]
  Subj: HP48: Aviation/Flight Planning programs
  Date: Thu Jun 06 1991

[Note: Eric describes how to "unpack" the program.  He is referring to the
 source code listing, called FLY.SRC on this disk.  But you don't need to
 bother "unpacking" it, because I already did.  The binary file, called
 FLY on this disk, is fully "unpacked" and ready to download and run.  -jkh-]

   What follows is a group of programs making up an electronic flight
computer of sorts.  The flight computer is made up of 6 functions:

      Weight and Balance with 9 plane memory and CG graphing
      Flight plan of up to eight legs
      Winds aloft calculation
      Density altitude
      Distance and heading between two points
      Crosswind components

Each will be described more fully later.  These functions can be accessed
either alone, or by selecting from a menu presented by running START.
There is a minimal amount of error checking in the programs, but if run
from the START menu, the stack will be cleaned up if an error does occur.
If flag 10 is set, the output of some of the program is changed to metric.
Units are allowed (even encouraged) unless noted below, and appropriate 
conversions made.  Extensive use is made of PGROB and UPGROB from Erik Bryntse,
and they are included in the directory.  The last four functions could be done
much more compactly with the equation solver, but the programs provide a front
end for things.  The CST menu is also defined for conversions between fuel
volume and weight (at 6lbs/gal).
   The whole thing is rather large, and to download on my 30K calculator
requires removing everthing but ASC-> and ->ASC.  ASC-> is required to unpack
the directory.  When I download it, everything goes fine until the last packet
or two, when the calculator quits responding.  Both Kermits eventually time out,
and the directory is present and whole on the calculator.  I'm not sure if this
is just my calculator, or what.  If it happens, just be patient.  Once
downloaded, press AERO to get into the directory, then SETUP to unpack it.
Press START to begin.

                             Notes:

FPLAN, WIND, and CWIND use vector arithmetic, so beware if you have an HP 48
with the vector bug.  The checksums are:

 Before unpacking: #11040d
                   23664.5

 After unpacking:  # 5241d
                   17881.5

Disclaimer:  Use at your own risk.  Feel free to redistribute in whole
or in part if it strikes your fancy.  If you want to make improvements, go
ahead - I'm graduating in a week and a half, and losing net access, so I can't
post any I make.

                             Program Descriptions:

  The primary programs are described in the order they appear in the VAR menu.
Since the directory is rather large, I have included a list of programs
that call each program, so if you decide you don't want one of the functions,
you can delete all the programs that only it calls.  To save memory, I run
without START and HELP, which saves about 5K.  I apologise if the descriptions
are a little cryptic.  The program follows the descriptions.

START:  Called by: None
        Use the arrow keys to move around, and ENTER to select choice.
        Press any key to return to menu after program execution.
HELP:   Called by: START, self executable
        Presents three short help screens.
FPLAN:  Called by: START, self executable
        Computes magnetic heading, groundspeed, time en route, and fuel
        burn for up to eight legs of a flight.  If units are entered for
        distance or fuel consumption rate on the first leg, units must be
        entered for each remaining leg.  Time is shown in Hours:minutes
        format.
W&B:    Called by: START, self executable
        Compute weight and balance for selected aircraft, and plots weight
        vs moment arm if graph is defined for aircraft.  Output is metric
        if flag 10 is set.  If a graph has been defined for the plane chosen,
        flag 10 must be set so the output matches the units used in defining
        the graph for the graph to be valid.  Choose ADD/DELETE to add a new
        plane or delete an old one.  When adding a plane, select 0 for the
        number of points in the graph to save memory.  If you want to define
        a graph, select a number of points equal to the number of line
        segments in the graph + 1.  A line will be drawn from each point to the
        next point entered.  Points are entered in the form (without units)
        { moment/1000 weight }.  When asked for a station name, keep in
        mind that W&B will append "weight and moment arm" after the name
        you supply.
WIND:   Called by: START, self executable
        Calculates winds aloft from true course, ground speed, true heading
        and true airspeed.
DALT:   Called by: START, self executable
        Calculates density altitude from pressure altitude and temperature.
        Valid only for altitudes less than 36000 ft.
DISTANCE: Called by: START, self executable
        Calculates distance and true heading between two points of
        latitude and longitude entered in hhh.mmss form.  Points in
        the southern or eastern hemisphere may need to be entered as
        negative.  The program has only been tested for points N and W.
CWIND:  Called by: START, self executable
        Given a heading and wind speed and direction, calculates headwind
        and crosswind components.  Does not support units - units of
        components are same as of wind speed.
PAUSE:  Called by: START
TRAP:   Called by: START
MAKEMENU: Called by: none
        Utility to make a menu for use with CHOOSE.
ADDPLANE: Called by: W&B
STRIP:  Called by: START, FPLAN
PAD:    Called by: START
CHOOSE: Called by: START, W&B, ADDPLANE
        Call with initial cursor position in stack level 2, and the menu grob
        in level 1.  Returns cursor postion when ENTER is pressed.
ADDGRAPH: Called by: ADDPLANE
SCL:    Called by: ADDGRAPH, CGGRAPH
WBIN:   Called by: W&B
CGGRAPH: Called by: W&B
PGROB, UPGROB: Called by: HELP,CHOOSE, ADDPLANE, CGGRAPH, ADDGRAPH, FPLAN
PLANES: Called by W&B, ADDPLANE
        Stores the list of planes for use by W&B. Each plane list has the
format
        { { CGgraph maxmoment minmoment maxweight minweight }
          { { station1name station1weight station1arm }
            { station2name station2weight station2arm }
                                .
                                .
                                .
            { stationNname stationNweight stationNarm } }
          "Plane name"
        }
FPLAN.GROB: Called by: FPLAN
HELP.{123}: Called by: HELP
STMENU: Called by: START
WBMENU: Called by: W&B, ADDPLANE
CURSOR: Called by: CHOOSE
UNITMENU: Called by: W&B, ADDPLANE
PLMENU: Called by: ADDPLANE
DESCMENU: Called by: ADDPLANE
Gal: Called by: W&B, FPLAN, ADDPLANE, CST    (Defines 1 Gallon = 6 lbs)
L: Called by: W&B, FPLAN, ADDPLANE, CST
CST: Called by: None