Hydrography Office works under supervision of Maritime Safety and Environmental Protection Department. This office must comply with IMO and IHO rules and regulations.
To provide safety of vessels which are in traffic in this area, hydrography office has prepared a number of nautical charts. This office is responsible for identifying and determining all marine obstacles and informing mariners about them via nautical charts. The spots must be considered by this office include shallow waters, buoys, access channels, breakwaters, basins, and berths. Considering nautical charts and recorded depths, mariners are able to choose safe passages.
If a passage is recognized as an unsafe area, then hydrography office informs dredging office to start dredging operation.