The Sea, ships and the surveyors

The story of the hydrographic survey and the charting of oceans. The RAN hydrographic survey ship and three patrol boats survey the approaches to Groote Eylandt in the Gulf of Carpentaria, to provide safe shipping lanes for the bulk ore carriers that come to transport the ore to the refineries. Shows mining operations, modern surveying techniques, the production of the chart and the use of the chart by merchant ships.