use GIS::Distance;
my $gis = GIS::Distance->new();
$gis->formula('Cosine');
print $gis->distance( 60.1843160, -128.5069940 => 29.46786, -98.53506 )
    ->value('mile'), " miles\n";
print $gis->distance( 32.9697, -96.80322 => 29.46786, -98.53506 )
    ->value('kilometer'), " kilometers\n";
print $gis->distance( 32.9697, -96.80322 => 29.46786, -98.53506 )
    ->value('nautical_mile'), " nautical miles\n";