CREATE TABLE table_name_80 (tonnage_grt INT, date VARCHAR)

what is the most tonnage grt of any ship sunk or captured on 16 jan 16?
SELECT MAX(tonnage_grt) FROM table_name_80 WHERE date = "16 jan 16"
SELECT MAX("tonnage_grt") FROM "table_name_80" WHERE "16 jan 16" = "date"