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-.TH DIST 7 purdy
-.CT 1 inst_info
-.SH NAME
-dist, dme, plan, path, cross \(mi aviation navigation
-.SH SYNOPSIS
-.B /usr/ken/bin/dist
-.I obj obj ...
-.PP
-.B /usr/ken/bin/dme
-.I obj radial dist
-.PP
-.B /usr/ken/bin/plan
-[
-.BI - dist1
-[
-.BI - dist2
-]]
-.I obj obj
-.PP
-.B /usr/ken/bin/path
-[
-.BI - dist
-]
-.I obj obj ...
-.PP
-.B /usr/ken/bin/cross
-[
-.BI - dist
-]
-.I obj
-.SH DESCRIPTION
-These routines provide navigation services
-using an aviation database.
-.I Objects
-in the database are of four types:
-VORs ending in 
-.BR .v ,
-airports ending in 
-.BR .a ,
-NDBs ending in 
-.BR .n ,
-and intersections ending in 
-.BR .i .
-An ambiguous object specified without
-suffix is interpreted in the above order.
-.PP
-The canonical program in this series,
-.IR dist ,
-prints the magnetic bearing and distance in
-nautical miles between a set of two or more specified objects.
-The magnetic correction is applied at the first of a pair
-of objects,
-so the bearing from Morristown to San Diego is
-281 degrees while the reverse is 50 degrees.
-.I Dist
-also prints a frequency for objects.
-For VORs and NDBs,
-the frequency is obvious.
-For airports,
-the frequency is sometimes the tower frequency,
-sometimes UNICOM and sometimes zero.
-Intersections have no frequency.
-.PP
-.I Dme
-prints the latitude and longitude
-of a point that is a bearing and distance from an object.
-The format printed is the source form of the database of objects.
-.I Dme
-is used to create new objects for the database \(mi usually intersections.
-.PP
-.I Plan
-finds a shortest distance from one object to another traveling
-along a route of VORs.
-The optional argument
-.I dist1
-is the maximum allowable distance between VORs
-en route (default 100 nautical miles) and
-.I dist2
-is the maximum allowable distance between the starting
-object and the first VOR and the last VOR and terminal object
-(default 50).
-.PP
-.I Path
-lists all objects in the database that lie
-within
-.I dist
-(default 10 nautical miles)
-of the great circle route between two objects.
-If more than two arguments are given,
-routes are calculated for each pair of objects.
-The list is ordered by distance along the route.
-The tangential distance to each object is given
-with negative to the left and positive to the right.
-.PP
-.I Cross
-prints all objects in the database
-within
-.I dist
-(default 50 nautical miles)
-from the given object.
-.SH FILES
-.TP /usr/ken/lib/obj
-objects
-.SH SEE ALSO
-.IR avw (7)
-.SH BUGS
-The database is old and should not be used for navigation purposes.
-.br
-Frequencies for airports are inconsistent.
-.br
-.I Plan
-uses low power (terminal) VORs when very often these
-cannot be tracked from 50 miles.
-.br
-.I Plan
-will cheerfully plan routes through prohibited areas,
-over open water and over high mountains.
-The only criterion is the distance between objects.
-.br
-.I Cross
-has bugs.