Assessments of the Challenges of Hydrography and Accuracy of the Chart Information Based on Requirements on Nautical Charts in Tanzania

Abstract
Many of the electronic chart position deviations that observed today come from past graphic collecting techniques of Nautical Chart.This study introduces an assessment of the challenges of hydrography and accuracy of the chart information based on requirements on nautical charts in Tanzania. The assessment of the challenges of hydrography and accuracy of the chart information is particularly important to strengthen data accuracy and meet the requirement of nautical charts in Tanzania. Primary data were collected through face-to-face interviews with the respondents and questionnaires as a tool. Secondary data obtained through, journals, articles, and report both published and unpublished. Quantitative data were analyzed by using SPSS whereas qualitative data analyzed by using content analysis. Data provided in this article will improve nautical navigational charts practices in Tanzania and reduce variation greatly in accuracy to help mariners make informed decisions based on the data in their on-board navigation systems. The article is relevant to the new IHO guide on how to assess the accuracy and reliability of depth and position information in nautical navigation charts. The recommendations have been arranged that nautical charts, which offer much considerable information for the safe navigation of ships, are able to work more efficiently. Key words: Hydrography, Chart Information, Nautical charts, Tanzania