The service shows the data quality of the depths in Norwegian nautical products. Data quality says something about the survey methods, accuracy of position and depth and grade of full area search.\\n\\nOfficial nautical charts are divided into different navigation purposes/scale classes, following recommendations from the International Hydrographic Organization (IHO). There is a difference in generalization in the different scales and the zoomlevel of the service is similarly adatpted to the scales Overview, General, Coastal, Approach, Harbour and Berthing.\\n\\nIt is the International Hydrographic Organization (IHO) that regulates the categories into which data quality is divided. Data quality is divided into different quality categories, so-called Zones of Confidence (ZOC). There are five different ZOC categories, where A1 is the best and D is the worst. In addition, there is a category U, which shows areas where data quality has not been considered. This dataset also shows areas that have not been measured and depths are unknown.