(comp.sources.hp48)
Author:  [Robert Irving]
Subj:    GREAT CIRCLE NAVIGATION
         Version:   1-2
         Checksum:  # 3962h
         Bytes:     8716.5
Date:    15 Nov 1992
Keywords:  Great circle, Rhumbline, Vertex, Position

These programs are SHAREWARE.  Copyright (C) 1992 by Robert 
Irving.  See end of document for conditions on use.

I suggest that the DIR name 'GCIRNAV' be changed to 'GCIR'
before transfer to the HP48.  Bytes will be 8713.5.

PROGRAMS

CNT             One-key CONTinue command.
CONV            Converts input in DDD.MMT (degrees.minutes
                &tenths) to DDD.DDD (decimal degrees).
GCST            Prompts for endpoints of great circle (gc) path.
VRTX            Calculates vertices of gc.
BRG             Calculates initial bearing of gc.
INCRE           Prompts for type (DIST or LONG) of increments.
LNGI            Prompts for magnitude of LONG increment.
DISTI           Prompts for magnitude of DIST increment.
GCPR            Initiated waypoint calculations.
LNGC            Calculates waypoints for LONG increments.
DISTC           Calculates waypoints for DIST increments.
RHMB            Calculates course & distance for legs.

OBJECT

CST1            List used for Custom Menu.

OPERATION

These programs prompt for all necessary inputs.  Input of 
endpoints is in format DDD.MMM (degrees.minutes&tenths).  
Size & number of legs may be determined either by length
(DIST) or span of longitude (LONG) between waypoints.
Output of waypoints is in format DDD.MM.  Initial bearing of 
gc and course for each leg are in format DDD.D.  Distances 
are in nautical miles (NM) in format NNNN.NN.  All programs 
provide a precision of better than 0.1'.  If a vertex of the 
gc is on the path traveled, provision is made for a "composite"
(latitude limited) path, for example, to avoid icepacks or the 
Antarctic continent. 

NOTICE  

The author has exercised due diligence in the preparation of 
these calculator programs.  The author has, in the handbook
available for purchase (See SHAREWARE below) made adequate  
explanations, including provision of instructions and 
CAUTIONs for proper use and WARNINGs as to the potential
results of misuse.  The author reserves the right to make 
improvements in these programs at any time, and without notice.

EACH ENDPOINT AND WAYPOINT MUST BE TRANSFERRED TO A STANDARD 
NAVIGATIONAL CHART AND EACH RHUMBLINE (LEG) MUST BE DRAWN IN 
TO ENSURE THAT THERE ARE NO OBSTRUCTIONS ON THE PATH.  FAILURE 
TO DO SO MAY HAZARD THE VESSEL.

The author makes no warranties, either express or implied, with 
respect to the software described herein, its quality, 
performance, merchantability or fitness for any particular
purpose.  These programs are provided "as is".  The author shall 
not be liable for errors contained herein, nor for direct, 
indirect, incidental or consequential damages in connection with
the performance or use of the software described herein.

The author has no business or financial relationship with 
HEWLETT PACKARD.

SHAREWARE

These calculator programs are a SHAREWARE product protected by 
Copyright.  They are neither Public Domain nor FREE software.
You may use these programs to determine if they are suitable for
your purposes, and you may make copies to give to others for the
same objectives provided the copies include ALL the original 
material including this document.  The author does not receive 
any fee from bulletin boards or other methods of distribution.  
The author is paid only when you make a direct payment in order
to register.  

If these programs are useful to you, please send a payment of 
$15.00 (US funds) to:  Robert Irving, 9234 Cayuga Avenue, 
Sun Valley, CA  91352-1303.  

In return for your registration, you will receive the handbook,
including detailed instructions, CAUTIONs, and WARNINGs; an 
annotated source code; and a sample solution.  In addition, you
will be notified when revisions of the programs or the handbook
are produced, and advised of any similar new products developed.

NOTE:  An equivalent program is available for the IBM PC in 
GW-BASIC or QBASIC on 3\" or 5^" DD or HD disk (specify BASIC & 
disk size/density) at $20.00 US.

 - - - - - - - - - - - - - CUT HERE - - - - - - - - - - - - - - 

TO:  ROBERT IRVING
     9234 CAYUGA AVENUE
     SUN VALLEY, CA  91352-1303

SUBJ:  REGISTRATION FOR GCIRNAV PROGRAMS 1-2

1.  I ENCLOSE PAYMENT IN THE AMOUNT OF $15.00 US FUNDS.  
ADD MY NAME TO THE LIST OF REGISTERED USERS, AND SEND ME 
A COPY OF THE CURRENT HANDBOOK FOR SUBJECT PROGRAMS.

                        NAME:  __________________________
                        STREET/APT:______________________
                        CITY/ST/ZIP:_____________________