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ADMIRALTY Reference and Plotting Charts

Our extensive range of reference and plotting charts are designed to be used alongside official navigational charts, whether SNCs or ENCs, to help bridge crews create safe and efficient passage plans.

Gnomonic Charts

​Used in passage planning to plot great circle routes as a straight line. These charts are useful for devising composite rhumb line courses.

Fifteen charts are available covering the oceans of the world: North Atlantic, South Atlantic, North Pacific, South Pacific and Indian Ocean.


World Time Zone Chart

The World Time Zone Chart was originally devised so that any mariner, in any part of the world, could relate their local time to Standard Greenwich Mean Time.​


Load Line Regulation Charts

Merchant Shipping (Load Line) Regulations cover the draught to which vessels (subject to SOLAS regulations) may be loaded in designated zones across the world.

The Load Line Chart reflects the changes made in the 1998 Merchant Shipping Regulations and includes the latest designated zones and seasonal periods relating to Load Line Rules.


Magnetic Variation Charts

Six charts which show the current magnetic variation and the annual rates of change.

Whilst local information is shown on all charts, this series provides more detailed coverage at a worldwide level.


Mercator Plotting Sheets

A series of 23 charts each covering three degrees of latitude with a compass rose and latitude scale, longitude being defined by the user.

This facilitates dead reckoning plots to be visualised, and the plotting and resolution of position lines of celestial observations.


Ocean Plotting Sheets

A series of 20 charts at scales 1:250,000 and 1,000,000. They use mercator and stereographic projection and are useful in plotting great circle routes derived from gnomonic charts.


Instructional Charts

​​​​Instructional Charts are useful for training and examination purposes. They are not maintained for the latest information and should not be used for navigation.