CHARTED PILES IN THE VICINITY OF LAT. 47/32/22.7 N, LON. 122/11/53.77 W. (NAD83) APPLIED TO CHART # 18447 FROM OLD CHART #  6449 (WHICH HAS BEEN DISCONTINUED). CHART HISTORY FOR CHART # 6449 IS NOT AVALIABLE. ORIGINIAL SOURCE HAS NOT BEEN ASCERTAINED. TH