In your second while look, don't use array variables (@MMDDdata, @Stages1, etc.) Use scalars (same names but prefixed with a $): 
   while (<DATA>) {
     my ($MMDDdata, $Stages1, $LAT1, ...) = unpack($ormat1, $_);
     last if (!defined($LAT2));

     print OUT "$MMDDdata 0000 $LAT1 $LONG1 ...\n";
   }

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In reply to Re: Parser help by pc88mxer
in thread Parser help by MKevin

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