Nautical Chart
The creation of a nautical chart based on the Indonesian Coastal Environmental Map (LPI) adheres to the Indonesian National Standard (SNI) 19-6726-2002. The Indonesian Coastal Environmental Map (LPI) depicts coastal environmental areas throughout Indonesia. Therefore, there is another type of bathymetric map, but both use the standardization of Map No.1, and the regulations published by the International Hydrographic Organization (IHO), namely S-4 Regulations Of The IHO for International (INT) Charts And Chart Specifications of The IHO.
The Indonesian Coastal Environmental Map (LPI) is a map depicting coastal environmental areas throughout Indonesia. As a means of information for the public, maps must have the capability to provide dynamic data and information about the Earth's surface. Additionally, maps should meet predetermined criteria, be attractive, easy to understand, and comprehensible to all parties. All types of maps must be created in accordance with national standards and regulations while considering cartographic aspects to ensure uniformity and clarity, thus avoiding confusion among users.
Bakosurtanal (National Coordinating Agency for Surveys and Mapping) uses references published by the National Standardization Agency (BSN), namely the Indonesian National Standard (SNI) 19-6726-2002. This reference also adheres to Chart No. 1, an international guideline from the International Hydrographic Organization (IHO), published by the Hydro-Oceanographic Office (DISHIDROS) as the agency responsible for hydrographic surveying, maritime affairs, and navigation. DISHIDROS has authority in determining references used for map production, especially nautical charts, which also includes the creation of the LPI map.
From the symbology rules of Chart No. 1, it is known that the color yellow represents land. Then, according to the S-4 regulations, it is also stipulated about water colors, where depths of 0 – 10 meters use dark blue, depths of 10 – 20 meters use light blue, and depths greater than 20 meters use white. From these colors, we can infer that the conditions of Waduk Sermo are quite steep and deep.