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From: rje@cae780.UUCP (Bob Evans)
Newsgroups: net.aviation
Subject: Navigation DataBase
Message-ID: <1341@cae780.UUCP>
Date: Tue, 17-Sep-85 21:15:10 EDT
Article-I.D.: cae780.1341
Posted: Tue Sep 17 21:15:10 1985
Date-Received: Sat, 21-Sep-85 00:46:44 EDT
Distribution: na
Organization: Tektronix, Inc. (CAE Systems Division), Sunnyvale, CA
Lines: 91
Keywords: Great Circle Navigation

I would like to thank the person who posted the great circle navigation
program. As a result of the posting I tried the program, liked it, and
started creating a database for use with the program. I have created a VOR
file that contains all of the VORs for California, Nevada and Oregon. I have
also created an AIRPORT file that contains the tower controlled airports
for the same three states. I am working on an AIRPORT file that contains the
non-controlled airports, but won't have that finished for a week or so ...
If there is interest, I will post that file also.

As to using the program  I have found only two problems -
  1. Waypoints are not calculated to form a 90 angle between the route
     of flight and the radial. I don't think that is a big problem, but
     makes use of sequential VORs somewhat difficult as the program will
     often pick waypoints that are quite close together.
  2. When using VORs that are not between the origin airport and the
     destination airport, the program does not compute a waypoint at the
     airports from the first and last VORs. Instead, you will be routed
     away from the correct line of flight. An example of this follows.
Palo Alto	(Palo Alto)
PAO	altitude:				5 feet


rvor	WP1					freq: 113.9
		*** L Oakland FSS ***

wp	OSI R-163.0 / 4.9

		PAO to WP1
Magnetic:					204
Distance:					12.0 NM
(true course 221, Total distance 12.0)

rvor	WP2					freq: 116.0
		*** H Stockton FSS tweb ***

wp	SCK R-343.0 / 28.0

		WP1 to WP2
Magnetic:					025
Distance:					79.3 NM
(true course 042, Total distance 91.4)

rvor	WP3					freq: 114.8
		*** H Sacramento FSS ***

wp	LIN R-343.0 / 22.3

		WP2 to WP3
Magnetic:					025
Distance:					11.7 NM
(true course 042, Total distance 103.1)

rvor	WP4					freq: 115.5
		*** L Sacramento FSS tweb ***

wp	HNW R-163.0 / 3.5

		WP3 to WP4
Magnetic:					025
Distance:					17.9 NM
(true course 042, Total distance 121.0)

rvor	WP5					freq: 117.9
		*** H Reno FSS tweb ***

wp	RNO R-342.0 / 3.7

		WP4 to WP5
Magnetic:					025
Distance:					75.3 NM
(true course 042, Total distance 196.3)


		WP5 to RNO
Magnetic:					205
Distance:					7.7 NM
(true course 223, Total distance 204.0)
Cannon Int	(Reno)
RNO	altitude:				4412 feet

I haven't looked at the code to see if this can be remedied.

Have Fun,
Bob Evans

FROM:   Robert J. Evans, CAE Systems Division of Tektronix, Inc.
UUCP:   tektronix!teklds!cae780!rje
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