Charts. Tamar River. River Tamar, Low Head to Launceston, Tasmania, north coast, entrance from British surveys in 1880 and 1924, between Georgetown and Launceston from Tasmanian Govt. survey in 1906; with inset, Beauty Point Harbor, from British survey in 1924; chart 3572. Scale naut. m.=1.9 in., natural scale 1:38,065.