BEGIN   {
	    printf("DAY  SPEED   DIR   RAWSP  RDIR   CO   VANE RDIR-DIR SAMPLES\n");
	}

(! /^#/ ) {
	    newday = int($1);
	    if ( (newday != day) && (day != 0) )
	    {
		printday(day);
		clearday();
	    }
	    day = newday;
	    if ( $18 > 0.4 )
	    {
		speed += $18;
		dir += $19;
		rawsp += $25;
		rawdir += $24;
		compass += $22;
		vane += $23;
		diff = $24 - $19;
		if ( diff > 180. )
		    diff -= 360.;
		if ( diff < -180. )
		    diff += 360.;
		dirdiff += diff;
		samples++;
	    }
	}

END     {
	    printday(day);
	}

function printday(day)
{
	if ( samples > 0 )
	    printf("%3d  %6.3f %5.1f %6.3f  %5.1f %5.1f %5.1f  %5.1f   %3d\n",
		day, speed/samples, dir/samples, rawsp/samples, rawdir/samples,
		compass/samples, vane/samples, dirdiff/samples, samples);
}

function clearday()
{
	    samples = 0;
	    speed = 0;
	    dir = 0;
	    rawsp = 0;
	    rawdir = 0;
	    compass = 0;
	    vane = 0;
	    dirdiff = 0;
}