CL 690/1990, DURING CRUISE TC-90-03 IN SOUTHEAST ALASKA THE TOWNSEND CROMWELL, A NOAA FISHIERIES VESSEL ENCOUNTERED A SIGNIFICANT DISCREPANCY IN CHART DEPTH. A DEPTH OF 18 FATHOM ON CHART #17326, POSITION LAT. 56/42/44.8 N., LON. 135/27/37.8 W.(NAD83)  W