Thank you. This works well, regardless if the vehicle's actual location will be plus or minus the pre-determined coordinates I'll be comparing against.
Mock up:
use warnings;
use strict;
use feature 'say';
use constant {
ACCURACY => 1e5,
RANGE => 1.2,
LON => -119.31665,
};
my $lon_current = -119.31666;
my $deviation = abs(ACCURACY * (LON - $lon_current));
say "Within range: $deviation" if $deviation < RANGE;
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