Due to the rising traffic density, especially in and around harbors, it is challenging to maneuver a ship through the harbor to or from the mooring dock. Therefore, an accurate and flexible assisting system for pilots is needed. Nowadays ship navigation in the harbor area is based on the same technology as normal route navigation in the open water. In most cases this technology consists of common GPS receiver, sometimes combined with digital map. However the harbor is a very specific region, with a lot of traffic, where accurate and reliable localization and therewith effective, and safety navigation is crucial. There have been numerous initiatives aiming at developing a automatic docking system. However, their use refers only to the final phase of approaching the ship to the wharf. One example is given by Zalewski [2012] where laser scanners improve the position accuracy. ANCHOR does not aim at automating the docking process but on improving the whole harbor approach