SPECTROMETRY OF STANDARD COLOURS ON CROATIAN SEA CHARTS

Sa？etak The standardization of colours on the official navigation sea charts worldwide includes recommendations and technical specifications to avoid confusion and/or errors due to the application of different colour combinations and therefore adversely affect navigation safety. Since no data on the spectrography of applied colours have been available so far, spectrographic measurement is conducted as a starting point for standardizing the use of colours on sea charts. This paper presents spectrograms of colours on the Croatian sea charts, and for the first time, apart from the visible part of spectrum, it also shows results for the part of the near-infrared part of electromagnetic spectrum. In conclusion, the results of colour use on the Croatian sea charts are interpreted and a recommendation is made to measure the spectrography of colours on the charts of other IHO member states. The results obtained will be the basis for the introduction of colour-twins or the system of hidden graphic elements to expand the information content of charts, which is the ultimate objective of the researc