Admiralty chart

Admiralty Charts are charts of the United Kingdom Hydrographic Office ( UKHO ) and are under Crown Copyright. About 3,000 tickets are available and cover almost the entire world in different levels of detail depending on the traffic density and dangers from. Cards with large scales often show access routes and access to ports, medium-sized maps cover intensively used coastal areas and small cards are intended for navigation in the open sea.

Include The Cards: Cards zero, coastline, fairway marking, land and underwater contours, composition of the seabed as anchoring means, tide information, salient landmarks ( eg steeples ), traffic separation schemes, lighthouses and focus everything that could support navigation.

The cards use the Mercator projection, so that the position information to the card can be taken directly, even if declination and deviation must be corrected. The use of this projection also has the advantage that the card drawn, straight lines indicate a constant rate, although in reality such a line is not straight, but only a segment of a three-dimensional rhumb.

The UKHO is out plans for various users. Standard cards are designed for sailors who fall under the International Convention for the Safety of Life at Sea. A2 size is used by recreational users, and in addition there are a number of additional digital products. Currently, electronic tickets are still not a legal replacement for paper maps.

The seabed and the environment are changing regularly and for the users of the timeliness of the information is important. The UKHO receives a large amount of new information and sifts and filters the most important for the user out. These updates are published weekly in Admiralty Notices to Mariners and indexed with a serial number and the week and year of publication. An annual overview will also be released shortly before the start of the sailing season. All maps should be updated regularly in order to obtain accuracy and security.