diff --git a/scripts/perl/dafif/build_ils.pl b/scripts/perl/dafif/build_ils.pl
new file mode 100755
index 000000000..b30db0075
--- /dev/null
+++ b/scripts/perl/dafif/build_ils.pl
@@ -0,0 +1,714 @@
+#!/usr/bin/perl
+
+########################################################################
+# Convert DAFIFT ARPT/ILS.TXT to FlightGear format.
+########################################################################
+
+use strict;
+
+my($faa_ils_file) = shift(@ARGV);
+my($dafift_arpt_file) = shift(@ARGV);
+my($dafift_ils_file) = shift(@ARGV);
+my($fgfs_ils_file) = shift(@ARGV);
+my($fgfs_apt_file) = shift(@ARGV);
+my($output_file) = shift(@ARGV);
+
+my($calc_loc)
+    = "/home/curt/projects/FlightGear-0.9/source/src/Airports/calc_loc";
+
+die "Usage: $0 " .
+    "<faa_ils_file> <dafift_arpt_file> <dafift_ils_file> <xplane_ils_file> <fgfs_apt_file> <output_file>\n"
+    if !defined($faa_ils_file) || !defined($dafift_arpt_file)
+       || !defined($dafift_ils_file) || !defined($fgfs_ils_file)
+       || !defined($fgfs_apt_file) || !defined($output_file);
+
+my( %CODES );
+my( %CodesByICAO );
+my( %ILS );
+my( %AIRPORTS );
+my( %RUNWAYS );
+
+
+&load_dafift( $dafift_arpt_file, $dafift_ils_file );
+&load_faa( $faa_ils_file );
+&load_fgfs( $fgfs_ils_file );
+&load_fgfs_airports( $fgfs_apt_file );
+&fix_localizer();
+
+&write_result( $output_file );
+
+exit;
+
+
+########################################################################
+# Process DAFIFT data
+########################################################################
+
+sub load_dafift() {
+    my( $arpt_file ) = shift;
+    my( $ils_file ) = shift;
+
+    my( $record );
+
+    my( $id, $rwy, $type );
+    my( $has_dme, $has_gs, $has_loc, $has_im, $has_mm, $has_om );
+    my( $dme_lon, $dme_lat, $dme_elev, $dme_bias );
+    my( $gs_lon, $gs_lat, $gs_elev, $gs_angle );
+    my( $loc_type, $loc_lon, $loc_lat, $loc_elev, $loc_freq, $loc_hdg,
+        $loc_width, $loc_id );
+    my( $im_lon, $im_lat, $mm_lon, $mm_lat, $om_lon, $om_lat );
+
+    # load airport file so we can lookup ICAO from internal ID
+
+    open( ARPT, "<$arpt_file" ) || die "Cannot open DAFIFT: $arpt_file\n";
+
+    <ARPT>;                          # skip header line
+
+    while ( <ARPT> ) {
+        chomp;
+        my(@F) = split(/\t/);
+        my($icao) = $F[3];
+        if ( length($icao) < 3 ) {
+            if ( length( $F[4] ) >= 3 ) {
+                $icao = $F[4];
+            } else {
+                $icao = "[none]";
+            }
+        }
+        $CODES{$F[0]} = $icao;
+        $CodesByICAO{$icao} = 1;
+        # print "$F[0] - $icao\n";
+    }
+
+    # Load the DAFIFT ils file
+
+    my( $last_id, $last_rwy ) = ("", "");
+
+    open( DAFIFT_ILS, "<$ils_file" ) || die "Cannot open DAFIFT: $ils_file\n";
+
+    <DAFIFT_ILS>;                   # skip header line
+
+    while ( <DAFIFT_ILS> ) {
+        chomp;
+        my @F = split(/\t/);
+        $id = $F[0];
+        $rwy = $F[1];
+
+        if ( $last_id ne "" && ($last_id ne $id || $last_rwy ne $rwy) ) {
+            # just hist the start of the next record, dump the current data
+
+            if ( ! $has_gs ) {
+                ( $gs_elev, $gs_angle, $gs_lat, $gs_lon ) = ( 0, 0, 0, 0 );
+            }
+            if ( ! $has_dme ) {
+                ( $dme_lat, $dme_lon ) = ( 0, 0 );
+            }
+            if ( ! $has_om ) {
+                ( $om_lat, $om_lon ) = ( 0, 0 );
+            }
+            if ( ! $has_mm ) {
+                ( $mm_lat, $mm_lon ) = ( 0, 0 );
+            }
+            if ( ! $has_im ) {
+                ( $im_lat, $im_lon ) = ( 0, 0 );
+            }
+            if ( $ILS{$CODES{$last_id} . $last_rwy} eq "" ) {
+                print "DAFIFT adding: $CODES{$last_id} - $last_rwy\n";
+                &safe_add_record( $CODES{$last_id}, $last_rwy, "ILS", 
+                                  $loc_freq, $loc_id, $loc_hdg, $loc_lat,
+                                  $loc_lon, $gs_elev, $gs_angle, $gs_lat,
+                                  $gs_lon, $dme_lat, $dme_lon, $om_lat,
+                                  $om_lon, $mm_lat, $mm_lon, $im_lat,
+                                  $im_lon );
+            }
+
+            $has_dme = 0;
+            $has_gs = 0;
+            $has_loc = 0;
+            $has_im = 0;
+            $has_mm = 0;
+            $has_om = 0;
+        }
+
+        $type = $F[2];
+        if ( $type eq "D" ) {
+            # DME entry
+            $has_dme = 1;
+            $dme_lon = make_dcoord( $F[16] );
+            $dme_lat = make_dcoord( $F[14] );
+            $dme_elev = $F[10];
+            if ( $dme_elev !~ m/\d/ ) {
+                $dme_elev = "";
+            } else {
+                $dme_elev += 0;
+            }
+            $dme_bias = $F[27];
+            # print "$id DME $dme_lon $dme_lat $dme_elev $dme_bias\n";
+        } elsif ( $type eq "G" ) {
+            # GlideSlope entry
+            $has_gs = 1;
+            $gs_lon = make_dcoord( $F[16] );
+            $gs_lat = make_dcoord( $F[14] );
+            $gs_elev = $F[10];
+            if ( $gs_elev !~ m/\d/ ) {
+                $gs_elev = "";
+            } else {
+                $gs_elev += 0;
+            }
+            $gs_angle = $F[7];
+            # print "$id GS $gs_lon $gs_lat $gs_elev $gs_angle\n";
+        } elsif ( $type eq "Z" ) {
+            # Localizer entry
+            $has_loc = 1;
+            $loc_lon = make_dcoord( $F[16] );
+            $loc_lat = make_dcoord( $F[14] );
+            $loc_elev = $F[10];
+            if ( $loc_elev !~ m/\d/ ) {
+                $loc_elev = "";
+            } else {
+                $loc_elev += 0;
+            }
+            ($loc_freq) = $F[5] =~ m/(\d\d\d\d\d\d)/;
+            $loc_freq /= 1000.0;
+            my( $magvar ) = make_dmagvar( $F[22] );
+            # print "mag var = $F[22] (" . $magvar . ")\n";
+            $loc_hdg = $F[24] + make_dmagvar( $F[22] );
+            $loc_width = $F[25];
+            $loc_id = $F[18];
+            if ( length( $loc_id ) >= 4 ) {
+                $loc_id =~ s/^I//;
+            }
+            # print "$id LOC $loc_lon $loc_lat $loc_elev $loc_freq $loc_hdg $loc_width\n";
+        } elsif ( $type eq "I" ) {
+            # Inner marker entry
+            $has_im = 1;
+            $im_lon = make_dcoord( $F[16] );
+            $im_lat = make_dcoord( $F[14] );
+            # print "$id IM $im_lon $im_lat\n";
+        } elsif ( $type eq "M" ) {
+            # Middle marker entry
+            $has_mm = 1;
+            $mm_lon = make_dcoord( $F[16] );
+            $mm_lat = make_dcoord( $F[14] );
+            # print "$id MM $mm_lon $mm_lat\n";
+        } elsif ( $type eq "O" ) {
+            # Outer marker entry
+            $has_om = 1;
+            $om_lon = make_dcoord( $F[16] );
+            $om_lat = make_dcoord( $F[14] );
+            # print "$id OM $om_lon $om_lat\n";
+        }
+
+        $last_id = $id;
+        $last_rwy = $rwy;
+        # printf("%-5s %10.6f %11.6f\n",  $F[0], $F[14], $F[16]);
+    }
+
+    if ( ! $has_gs ) {
+        ( $gs_elev, $gs_angle, $gs_lat, $gs_lon ) = ( 0, 0, 0, 0 );
+    }
+    if ( ! $has_dme ) {
+        ( $dme_lat, $dme_lon ) = ( 0, 0 );
+    }
+    if ( ! $has_om ) {
+        ( $om_lat, $om_lon ) = ( 0, 0 );
+    }
+    if ( ! $has_mm ) {
+        ( $mm_lat, $mm_lon ) = ( 0, 0 );
+    }
+    if ( ! $has_im ) {
+        ( $im_lat, $im_lon ) = ( 0, 0 );
+    }
+    if ( $ILS{$CODES{$last_id} . $last_rwy} eq "" ) {
+        print "DAFIFT adding (last): $CODES{$last_id} - $last_rwy\n";
+        &safe_add_record( $CODES{$last_id}, $last_rwy, "ILS", $loc_freq,
+                          $loc_id, $loc_hdg, $loc_lat, $loc_lon,
+                          $gs_elev, $gs_angle, $gs_lat, $gs_lon,
+                          $dme_lat, $dme_lon, $om_lat, $om_lon, $mm_lat,
+                          $mm_lon, $im_lat, $im_lon );
+    }
+}
+
+
+########################################################################
+# Process FAA data
+########################################################################
+
+sub load_faa() {
+    my( $file ) = shift;
+
+    open( FAA_ILS, "<$file" ) || die "Cannot open FAA data: $file\n";
+
+    <FAA_ILS>;                          # skip header line
+
+    while ( <FAA_ILS> ) {
+        chomp;
+
+        my ( $rec_type, $faa_id, $rwy, $type, $faa_date,
+             $faa_apt_name, $faa_city, $faa_st, $faa_state,
+             $faa_region, $id, $faa_len, $faa_wid, $faa_cat,
+             $faa_owner, $faa_operator, $faa_bearing, $faa_magvar,
+             $loc_type, $loc_id, $loc_freq, $faa_loc_latd,
+             $faa_loc_lats, $faa_loc_lond, $faa_loc_lons, $loc_width,
+             $faa_stop_dist, $faa_app_dist, $faa_gs_type, $gs_angle,
+             $faa_gs_freq, $faa_gs_latd, $faa_gs_lats, $faa_gs_lond,
+             $faa_gs_lons, $faa_gs_dist, $gs_elev, $faa_im_type,
+             $faa_im_latd, $faa_im_lats, $faa_im_lond, $faa_im_lons,
+             $faa_im_dist, $faa_mm_type, $faa_mm_id, $faa_mm_name,
+             $faa_mm_freq, $faa_mm_latd, $faa_mm_lats, $faa_mm_lond,
+             $faa_mm_lons, $faa_mm_dist, $faa_om_type, $faa_om_id,
+             $faa_om_name, $faa_om_freq, $faa_om_latd, $faa_om_lats,
+             $faa_om_lond, $faa_om_lons, $faa_om_dist,
+             $faa_om_backcourse, $faa_dme_channel, $faa_dme_latd,
+             $faa_dme_lats, $faa_dme_lond, $faa_dme_lons, $faa_dme_app_dist,
+             $faa_dme_stop_dist, $blank)
+            = $_ =~
+            m/^(.{4})(.{11})(.{3})(.{10})(.{10})(.{42})(.{26})(.{2})(.{20})(.{3})(.{4})(.{5})(.{4})(.{9})(.{50})(.{50})(.{3})(.{3})(.{15})(.{5})(.{6})(.{14})(.{11})(.{14})(.{11})(.{5})(.{5})(.{6})(.{15})(.{4})(.{6})(.{14})(.{11})(.{14})(.{11})(.{6})(.{7})(.{15})(.{14})(.{11})(.{14})(.{11})(.{6})(.{15})(.{2})(.{5})(.{3})(.{14})(.{11})(.{14})(.{11})(.{6})(.{15})(.{2})(.{5})(.{3})(.{14})(.{11})(.{14})(.{11})(.{6})(.{9})(.{4})(.{14})(.{11})(.{14})(.{11})(.{6})(.{5})(.{34})/;
+
+        $id = &strip_ws( $id );
+        $rwy = &strip_ws( $rwy );
+        $rwy =~ s/\/$//;
+        $rwy =~ s/\/$//;
+        $loc_id =~ s/^I-//;
+        my( $loc_hdg ) = $faa_bearing + make_dmagvar($faa_magvar);
+        my( $loc_lat ) = make_dcoord($faa_loc_lats) / 3600.0;
+        my( $loc_lon ) = make_dcoord($faa_loc_lons) / 3600.0;
+        # print "$loc_lon $loc_lat $faa_loc_lons $faa_loc_lats\n";
+        my( $gs_lat ) = make_dcoord($faa_gs_lats) / 3600.0;
+        my( $gs_lon ) = make_dcoord($faa_gs_lons) / 3600.0;
+        my( $im_lat ) = make_dcoord($faa_im_lats) / 3600.0;
+        my( $im_lon ) = make_dcoord($faa_im_lons) / 3600.0;
+        my( $mm_lat ) = make_dcoord($faa_mm_lats) / 3600.0;
+        my( $mm_lon ) = make_dcoord($faa_mm_lons) / 3600.0;
+        my( $om_lat ) = make_dcoord($faa_om_lats) / 3600.0;
+        my( $om_lon ) = make_dcoord($faa_om_lons) / 3600.0;
+        my( $dme_lat ) = make_dcoord($faa_dme_lats) / 3600.0;
+        my( $dme_lon ) = make_dcoord($faa_dme_lons) / 3600.0;
+
+        # my( $key );
+        # print "$id - $rwy\n";
+        # $key = $id . $rwy;
+        # print "-> $key -> $ILS{$key}\n";
+        # $key = "K" . $id . $rwy;
+        # print "-> $key -> $ILS{$key}\n";
+
+        if ( $rec_type eq "ILS1" ) {
+            if ( length( $id ) < 4 ) {
+                if ( $CodesByICAO{"K" . $id} ) {
+                    $id = "K" . $id;
+                }
+            }
+            if ( $ILS{$id . $rwy} ne "" ) {
+                print "FAA updating: $id - $rwy $type\n";
+                &update_type( $id, $rwy, $type );
+            } else {
+                print "FAA adding: $id - $rwy\n";
+                &safe_add_record( $id, $rwy, $type, $loc_freq, $loc_id,
+                                  $loc_hdg, $loc_lat, $loc_lon, $gs_elev,
+                                  $gs_angle, $gs_lat, $gs_lon, $dme_lat,
+                                  $dme_lon, $om_lat, $om_lon, $mm_lat,
+                                  $mm_lon, $im_lat, $im_lon );
+            }
+        }
+    }
+}
+
+
+########################################################################
+# Process FlightGear ILS data
+########################################################################
+
+sub load_fgfs() {
+    my( $ils_file ) = shift;
+
+    open( FGILS, "zcat $ils_file|" ) || die "Cannot open FGFS: $ils_file\n";
+
+    <FGILS>;                          # skip header line
+
+    while ( <FGILS> ) {
+        chomp;
+        if ( ! m/\[End\]/ && length($_) > 1 ) {
+            # print "$_\n";
+            my( $type_code, $type_name, $icao, $rwy, $loc_freq, $loc_id,
+                $loc_hdg, $loc_lat, $loc_lon, $gs_elev, $gs_angle, $gs_lat,
+                $gs_lon, $dme_lat, $dme_lon, $om_lat, $om_lon, $mm_lat, $mm_lon,
+                $im_lat, $im_lon ) = split(/\s+/);
+            my( $code ) = $icao;
+            $code =~ s/^K//;
+            if ( $ILS{$icao . $rwy} ne "" ) {
+                print "FGFS: Skipping $icao - $rwy - already exists\n";
+                # skip approaches already in FAA or DAFIFT data
+            } elsif ( length( $icao ) < 4 || $icao =~ m/^K/ ) {
+                print "FGFS: Skipping $icao - $rwy - USA\n";
+                # skip USA approaches not found in FAA or DAFIFT data
+            } else {
+                print "FGFS adding: $icao $rwy\n";
+                &safe_add_record( $icao, $rwy, $type_name, $loc_freq, $loc_id,
+                                  $loc_hdg, $loc_lat, $loc_lon, $gs_elev,
+                                  $gs_angle, $gs_lat, $gs_lon, $dme_lat,
+                                  $dme_lon, $om_lat, $om_lon, $mm_lat,
+                                  $mm_lon, $im_lat, $im_lon );
+            }
+        } else {
+            print "FGFS discarding: $_\n";
+        }
+    }
+}
+
+
+########################################################################
+# Load the x-plane/flightgear airport/runway information
+########################################################################
+
+sub load_fgfs_airports() {
+    my( $infile ) = shift;
+
+    my( $id );
+
+    open( IN, "zcat $infile|" ) || die "Cannot open: $infile\n";
+
+    <IN>;                       # skip header line
+
+    while ( <IN> ) {
+        chomp;
+        my(@F) = split(/\s+/);
+        if ( $F[0] eq "A" ) {
+            $id = $F[1];
+        } elsif ( $F[0] eq "R" ) {
+            my($recip) = &rwy_recip( $F[1] );
+            $RUNWAYS{ $id . $F[1] } = "FOR $_";
+            $RUNWAYS{ $id . $recip } = "REV $_";
+        }
+    }
+}
+
+
+########################################################################
+# Run through the final ils list and adjust the heading to match the runway
+########################################################################
+
+sub fix_localizer() {
+    my( $key );
+    foreach $key ( sort (keys %ILS) ) {
+        my(@F) = split( /\s+/, $ILS{$key} );
+        print "FIXING: $key $F[2] $F[3] $F[4]\n";
+        if ( $RUNWAYS{$key} ) {
+            my(@G) = split( /\s+/, $RUNWAYS{$key} );
+            print "  LocPos = $F[7] $F[8]\n";
+            print "  RwyInfo = $G[0] $G[3] $G[4] $G[5] $G[6] $G[7]\n";
+            my($cmd)
+                = "$calc_loc $F[7] $F[8] $G[0] $G[3] $G[4] $G[5] $G[6] $G[7]";
+            open( CALC, "$cmd |" ) || die "Cannot open $calc_loc\n";
+            my( $j, $lat, $lon );
+            while ( <CALC> ) {
+                if ( m/New localizer/ ) {
+                    ($j, $j, $j, $lat, $lon) = split( /\s+/ );
+                }
+            }
+            if ( $G[0] eq "REV" ) {
+                $G[5] += 180.0;
+                if ( $G[5] >= 360.0 ) {
+                    $G[5] -= 360.0;
+                }
+            }
+            &update_loc( $F[2], $F[3], $lat, $lon, $G[5]);
+        }
+    }
+}
+
+
+########################################################################
+# Write out the accumulated combined result
+########################################################################
+
+sub write_result() {
+    my( $outfile ) = shift;
+
+    open( OUT, ">$outfile" )  || die "Cannot write to: $outfile\n";
+
+    # dump out the final results
+    print OUT "// FlightGear ILS data, generated from DAFIFT ARPT/ILS.TXT and FAA data\n";
+
+    my( $key );
+    foreach $key ( sort (keys %ILS) ) {
+        print OUT "$ILS{$key}\n";
+    }
+    print OUT "[End]\n";
+}
+
+
+########################################################################
+# Utility functions
+########################################################################
+
+
+# add a record to the master list if it doesn't already exist
+
+sub safe_add_record() {
+    my( $apt_id ) = shift;
+    my( $rwy ) = shift;
+    my( $type ) = shift;
+    my( $loc_freq ) = shift;
+    my( $loc_id ) = shift;
+    my( $loc_hdg ) = shift;
+    my( $loc_lat ) = shift;
+    my( $loc_lon ) = shift;
+    my( $gs_elev ) = shift;
+    my( $gs_angle ) = shift;
+    my( $gs_lat ) = shift;
+    my( $gs_lon ) = shift;
+    my( $dme_lat ) = shift;
+    my( $dme_lon ) = shift;
+    my( $om_lat ) = shift;
+    my( $om_lon ) = shift;
+    my( $mm_lat ) = shift;
+    my( $mm_lon ) = shift;
+    my( $im_lat ) = shift;
+    my( $im_lon ) = shift;
+
+    if ( $ILS{$apt_id . $rwy} eq "" ) {
+        # print "Safe adding (common): $apt_id - $rwy\n";
+        &update_record( $apt_id, $rwy, $type, $loc_freq, $loc_id,
+                        $loc_hdg, $loc_lat, $loc_lon, $gs_elev,
+                        $gs_angle, $gs_lat, $gs_lon, $dme_lat,
+                        $dme_lon, $om_lat, $om_lon, $mm_lat,
+                        $mm_lon, $im_lat, $im_lon );
+    }
+}
+
+
+# replace a record in the master list (or add it if it doesn't exist)
+
+sub update_record() {
+    my( $apt_id ) = shift;
+    my( $rwy ) = shift;
+    my( $type ) = shift;
+    my( $loc_freq ) = shift;
+    my( $loc_id ) = shift;
+    my( $loc_hdg ) = shift;
+    my( $loc_lat ) = shift;
+    my( $loc_lon ) = shift;
+    my( $gs_elev ) = shift;
+    my( $gs_angle ) = shift;
+    my( $gs_lat ) = shift;
+    my( $gs_lon ) = shift;
+    my( $dme_lat ) = shift;
+    my( $dme_lon ) = shift;
+    my( $om_lat ) = shift;
+    my( $om_lon ) = shift;
+    my( $mm_lat ) = shift;
+    my( $mm_lon ) = shift;
+    my( $im_lat ) = shift;
+    my( $im_lon ) = shift;
+
+    my( $record );
+
+    # remap $type as needed
+    $type = &strip_ws( $type );
+    if ( $type eq "LOCALIZER" ) {
+        $type = "LOC";
+    } elsif ( $type eq "ILS/DME" ) {
+        $type = "ILS";
+    } elsif ( $type eq "SDF/DME" ) {
+        $type = "SDF";
+    } elsif ( $type eq "LOC/DME" ) {
+        $type = "ILS";
+    } elsif ( $type eq "LOC/GS" ) {
+        $type = "LOC";
+    } elsif ( $type eq "LDA/DME" ) {
+        $type = "LDA";
+    }
+
+    $record = sprintf( "%1s %-5s %-4s %-3s  %06.2f %-4s %06.2f %10.6f %11.6f ",
+                       substr( $type, 0, 1 ), $type, $apt_id, $rwy,
+                       $loc_freq, $loc_id, $loc_hdg, $loc_lat, $loc_lon );
+    $record .= sprintf( "%5d %5.2f %10.6f %11.6f ",
+                        $gs_elev, $gs_angle, $gs_lat, $gs_lon );
+    $record .= sprintf( "%10.6f %11.6f ", $dme_lat, $dme_lon );
+    $record .= sprintf( "%10.6f %11.6f ", $om_lat, $om_lon );
+    $record .= sprintf( "%10.6f %11.6f ", $mm_lat, $mm_lon );
+    $record .= sprintf( "%10.6f %11.6f ", $im_lat, $im_lon );
+
+    # print "Updating (common): $apt_id - $rwy\n";
+    $ILS{$apt_id . $rwy} = $record;
+    $AIRPORTS{$apt_id} = 1;
+}
+
+
+# update the $type of the record
+sub update_type() {
+    my( $apt_id ) = shift;
+    my( $rwy ) = shift;
+    my( $new_type ) = shift;
+
+    my( $record );
+
+    if ( $ILS{$apt_id . $rwy} ne "" ) {
+        my( $type_code, $type_name, $apt_id, $rwy, $loc_freq, $loc_id,
+            $loc_hdg, $loc_lat, $loc_lon, $gs_elev, $gs_angle, $gs_lat,
+            $gs_lon, $dme_lat, $dme_lon, $om_lat, $om_lon, $mm_lat, $mm_lon,
+            $im_lat, $im_lon ) = split( /\s+/, $ILS{$apt_id . $rwy} );
+        # print "Updating type: $apt_id $rwy: $type_name -> $new_type\n";
+        $type_name = $new_type;
+        &update_record( $apt_id, $rwy, $type_name, $loc_freq, $loc_id,
+                        $loc_hdg, $loc_lat, $loc_lon, $gs_elev,
+                        $gs_angle, $gs_lat, $gs_lon, $dme_lat,
+                        $dme_lon, $om_lat, $om_lon, $mm_lat,
+                        $mm_lon, $im_lat, $im_lon );
+    } else {
+        die "Error, trying to update $apt_id - $rwy which doesn't exist\n";
+    }
+}
+
+
+# update the localizer position of the record
+sub update_loc() {
+    my( $apt_id ) = shift;
+    my( $rwy ) = shift;
+    my( $nloc_lat ) = shift;
+    my( $nloc_lon ) = shift;
+    my( $nloc_hdg ) = shift;
+
+    my( $record );
+
+    if ( $ILS{$apt_id . $rwy} ne "" ) {
+        my( $type_code, $type_name, $apt_id, $rwy, $loc_freq, $loc_id,
+            $loc_hdg, $loc_lat, $loc_lon, $gs_elev, $gs_angle, $gs_lat,
+            $gs_lon, $dme_lat, $dme_lon, $om_lat, $om_lon, $mm_lat, $mm_lon,
+            $im_lat, $im_lon ) = split( /\s+/, $ILS{$apt_id . $rwy} );
+        print "    Old pos = " . $loc_lat . "," . $loc_lon . " " . $loc_hdg . "\n";
+        print "    New pos = " . $nloc_lat . "," . $nloc_lon . " " . $nloc_hdg . "\n";
+        $loc_lat = $nloc_lat;
+        $loc_lon = $nloc_lon;
+        $loc_hdg = $nloc_hdg;
+        &update_record( $apt_id, $rwy, $type_name, $loc_freq, $loc_id,
+                        $loc_hdg, $loc_lat, $loc_lon, $gs_elev,
+                        $gs_angle, $gs_lat, $gs_lon, $dme_lat,
+                        $dme_lon, $om_lat, $om_lon, $mm_lat,
+                        $mm_lon, $im_lat, $im_lon );
+    } else {
+        die "Error, trying to update $apt_id - $rwy which doesn't exist\n";
+    }
+}
+
+
+# convert a lon/lat coordinate in various formats to signed decimal
+
+sub make_dcoord() {
+    my($coord) = shift;
+    my( $dir, $deg, $min, $sec );
+    my( $value ) = 0.0;
+
+    $coord = &strip_ws( $coord );
+
+    if ( $coord =~ m/^[WE]/ ) {
+        ( $dir, $deg, $min, $sec )
+            = $coord =~ m/^([EW])(\d\d\d)(\d\d)(\d\d\d\d)/;
+        $value = $deg + $min/60.0 + ($sec/100)/3600.0;
+        if ( $dir eq "W" ) {
+            $value = -$value;
+        }
+    } elsif ( $coord =~ m/^[NS]/ ) {
+        ( $dir, $deg, $min, $sec )
+            = $coord =~ m/^([NS])(\d\d)(\d\d)(\d\d\d\d)/;
+        $value = $deg + $min/60.0 + ($sec/100)/3600.0;
+        if ( $dir eq "S" ) {
+            $value = -$value;
+        }
+    } elsif ( $coord =~ m/[EW]$/ ) {
+        ($value, $dir) = $coord =~ m/([\d\s\.]+)([EW])/;
+        if ( $dir eq "W" ) {
+            $value = -$value;
+        }
+    } elsif ( $coord =~ m/[NS]$/ ) {
+        ($value, $dir) = $coord =~ m/([\d\s\.]+)([NS])/;
+        if ( $dir eq "S" ) {
+            $value = -$value;
+        }
+    }
+    # print "$dir $deg:$min:$sec = $value\n";
+    return $value;
+}
+
+# convert a magnetic variation in various formats to signed decimal
+
+sub make_dmagvar() {
+    my( $coord ) = shift;
+    my( $value );
+
+    if ( $coord =~ m/^[EW]/ ) {
+        my( $dir, $deg, $min, $date )
+            = $coord =~ m/^([EW])(\d\d\d)(\d\d\d) (\d\d\d\d)/;
+        $value = $deg + ($min/10)/60.0;
+        if ( $dir eq "W" ) {
+            $value = -$value;
+        }
+    } elsif ( $coord =~ m/[EW]$/ ) {
+        my( $deg, $dir )
+            = $coord =~ m/^(\d\d)([EW])/;
+        $value = $deg;
+        if ( $dir eq "W" ) {
+            $value = -$value;
+        }
+    }
+    # print "$dir $deg:$min = $value\n";
+
+    return $value;
+}
+
+# strip white space off front and back of string
+
+sub strip_ws() {
+    my( $string ) = shift;
+    $string =~ s/^\s+//;
+    $string =~ s/\s+$//;
+    return $string;
+}
+
+
+# return the reciprical runway number
+sub rwy_recip() {
+    my( $input ) = shift;
+
+    my($num, $letter);
+
+    if ( length($input) == 3 ) {
+        ($num, $letter) = $input =~ m/(\d\d)(.)/;
+    } elsif ( length($input) == 2 ) {
+        $num = $input;
+        $letter = "";
+    } else {
+        $num = "";
+        $letter = $input;
+    }
+    # print "RWY: $num - $letter <==> ";
+
+    if ( $num ne "" ) {
+        $num += 18;
+        if ( $num > 35 ) {
+            $num -= 36;
+        }
+        if ( $num < 10 ) {
+            $num = "0$num";
+        }
+    }
+
+    if ( $letter eq "R" ) {
+        $letter = "L";
+    } elsif ( $letter eq "L" ) {
+        $letter = "R";
+    } elsif ( $letter eq "C" ) {
+        $letter = "C";
+    } elsif ( $letter eq "N" ) {
+        $letter = "S";
+    } elsif ( $letter eq "S" ) {
+        $letter = "N";
+    } elsif ( $letter eq "E" ) {
+        $letter = "W";
+    } elsif ( $letter eq "W" ) {
+        $letter = "E";
+    }
+    # print "$num - $letter\n";
+
+    return "$num$letter";
+}