DESCRIPTION OF THE NAVIGATION AID DISPLAY SCREEN    RELEASE 3.10    PAGE 1 OF 6

In this program the display screen is a "window" to the navigation aid file.
This "window" can be moved up towards the top (beginning) of the file or down
towards the bottom (end) of the file.  In addition, a solid video block is
visible which can be moved up, down, right or left to select a data item to be
changed or a navigation aid to be deleted.  All of this movement is controlled
by the group of keys on the right-hand side of the keyboard, as follows:

The four keys with the small arrows and the numbers 8,2,4,6 are used to move
the solid video block up, down, left or right, respectively, within the
confines of what you see on the screen.  If necessary, the display will auto-
matically "scroll" up or down.

The Home (7) key moves all the way to the top (beginning) of the file; the End
(1) key moves all the way to the bottom (end) of the file.  PgUp (9) moves one
screen towards the top; PgDn (3) moves one screen towards the bottom (there is
a 1-line overlap).

The Num Lock and Caps Lock keys will have no effect here. The keystrokes are
accepted regardless of whether they are shifted or not.  But keystrokes are not
"remembered"; a function must be completed before another key is accepted.

DESCRIPTION OF THE NAVIGATION AID DISPLAY SCREEN                    PAGE 2 OF 6

Latitudes and longitudes are always displayed and printed in degrees:minutes:
seconds format, for example 37:15:45 W for 37 degrees, 15 minutes, 45 seconds
West.  This is true regardless of the format in which they are entered.

Internally, latitudes and longitudes are kept in decimal degrees, but are al-
ways rounded to the nearest second.  This is to insure that the value you see
on the screen is exactly the value that is stored on the disk.

Latitudes and longitudes may be entered in degrees, minutes and seconds; or in
degrees and decimal minutes; or in decimal degrees.  For example if you enter
37 degrees, 15.75 minutes it will be displayed as 37:15:45 (.75 minute x 60 is
45 seconds).  This should accept a variety of input formats.

Magnetic variation is always displayed and printed in degrees:minutes format.
For example, 9:30 E for 9 degrees, 30 minutes East.  Internally it is kept as
a whole number (integer) of minutes.  It may be entered in decimal degrees,
or in degrees and whole number minutes.  Entry of minutes is optional.  For
example, an entry of -9.5 will be displayed as 9:30 E.  Remember the "East is
least, West is best" rule.


DESCRIPTION OF THE NAVIGATION AID DISPLAY SCREEN                    PAGE 3 OF 6

Typing one of the following letter keys will invoke the corresponding function:

A = ADD a new navigation aid (or other type of waypoint) to the file.  A way-
    point can be any geographical location such as an electronic navigation
    aid, an airport or a mountain peak.  The program will ask for the name,
    latitude, longitude, magnetic variation, site elevation (above sea level),
    and two optional navaid frequencies.  Waypoints are always kept by the
    program and displayed in alphabetical name order. The location of the solid
    video block therefore has no effect when ADDing a new waypoint entry.

    The program keeps both a name and an optional identifier for each navaid.
    The identifier should be preceded by a special character to denote the type
    of navaid. The author recommends * for VORs, # for NDBs and @ for airports.
    A geographic waypoint such as a lake need not have an identifier.

    Examples of navaids are: SANFRANCISCO *SFO   BRIJJ (LOM)  #SF
                             SANFRANCISCO @SFO   BAY MEADOWS

    Waypoint name formats used by older versions of the program can be used.
    To cancel entry of data for a new navigation aid, just press the Esc key.

DESCRIPTION OF THE NAVIGATION AID DISPLAY SCREEN                    PAGE 4 OF 6

C = CHANGE the data item selected by the reverse video block.  This function
    allows you to change the value of any data item.  When changing the name
    and/or identifier the program will automatically re-locate it (if required)
    to maintain the proper alphabetical order.  When changing latitude, longi-
    tude or variation, you can enter just the part (degrees, minutes or sec-
    onds) you want, leaving the other items intact.

    To abort data entry, just press the Esc key.

D = DELETE the navigation aid (or other type of waypoint) selected by the solid
    video block.  This will delete ALL of the data items for that waypoint,
    regardless of where the solid video block is on that particular line.  The
    program first asks you for confirmation in case you pressed the wrong key.
    The program will not allow you to delete a navaid which appears in the
    active trip file.  WARNING: you CAN still delete a navaid which appears in
    trip files OTHER than the active trip file.

    In this version of the Flight Plan System, all changes that you make to the
    navaid file will automatically be saved on the disk.  There is no separate
    "save" function.

DESCRIPTION OF THE NAVIGATION AID DISPLAY SCREEN                    PAGE 5 OF 6

L = LOCATE a navaid entry by name or identifier.  If you precede your entry by
    a special character (such as *SFO) the program will look for an identifier.
    Otherwise, the program will look for a name.  It is usually only necessary
    to type in the first 2 or 3 characters of the name, for the program to find
    it.  Airports with 4-character identifiers such as CA05, or navaids without
    any identifier, must be located by name.  You may have to use the up- or
    down-arrow key a few times if the search key you entered is not unique.

    If your navaid file is large (several hundred entries), using the LOCATE
    function to find a particular navaid is faster than using the PgUp and PgDn
    keys repeatedly. LOCATE uses an efficient binary search technique for find-
    ing names, and an item-by-item search for finding the shorter identifiers.

O = OUTPUT to printer.  You get a formatted and paginated listing of all navi-
    gation aids and other types of waypoints.  The program first asks if the
    printer is ready; make sure it is ready and then type Y.  Or, press N or
    Esc to cancel the OUTPUT function.

    To stop the printing before it is finished, just press the Esc key.  This
    may not work if your printer has a big buffer or you use a print spooler.

DESCRIPTION OF THE NAVIGATION AID DISPLAY SCREEN                    PAGE 6 OF 6

T = TRIP display.  This function will display the active trip and allow you to
    add, delete and change trips.  You must make a trip current (by displaying
    it on the screen) before you can invoke the FLIGHT planning function.

S = re-SIZE the Navaid file.  This sets the MAXIMUM capacity of the file. It is
    used either to increase the size of a file created by an old version of the
    program, or to decrease the size of a file to save space on a diskette.
    ***WARNING*** Make sure your files are backed up!  This function will first
    delete your old Navaid file, and THEN write out the new re-sized one.
    It will NOT delete any of your Navaid records on the new file.

X = EXIT to the Master Menu screen.  Selection of navaid files is made from
    the Master Menu screen, therefore you must EXIT in order to start using a
    different Navaid file.
    Note: Invoking the TRIP, SIZE or EXIT functions will cause the navaid file
    to automatically be updated on disk.  The is no separate "save" function.
H = HELP - displays the explanatory information you are reading now.

***WARNING***Do NOT switch data diskettes without first returning to the Master
Menu screen. Failure to heed this rule may result in destruction of your files!
