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The marine charts and the chart-making and two major key factors for the maritime surveying and mapping. With the rapid development of the science and technology, the computer-aided editing technology has gradually replaced the manual work in the past. Today, the mapping software helps to reduce the time of the whole process from the edition of data collected with different systems, the composition of original charts to produce the final products after examination.
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Today, the total digital editing and mapping technology is used to produce the harbor and channel charts and replaced the manual way in the past. As the cartological works continuously intensifys, the electronic technology in chart producing is gadually introduced together with the optimazation of the quantity and the quality of the produced charts the printing equipments. Today, the computer-aided digital color-discriminating editing and plate making technology has replaced the manual way in the early 90s, thus reducing the whole process and improving the quaity of charts.
   
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