Admiralty Mercator Plotting Sheet D6325: Lat. 12° to 15°

An official Admiralty Mercator Plotting Sheet, printed on demand on quality, watermarked chart paper directly from the UKHO's latest digital files. Part of a series of 23 charts, each covering three degrees of latitude with a compass rose and latitude scale for dead reckoning and celestial navigation.

About Admiralty Mercator Plotting Sheets

Admiralty Mercator Plotting Sheets are specialised blank charts produced by the UKHO for navigation calculations and position plotting. Each sheet in this comprehensive series covers a precise three-degree latitude band and features a central compass rose for bearing measurement and a latitude scale for accurate position work. The longitude scale remains deliberately unnumbered, allowing navigators to designate meridians according to their vessel's estimated position. These sheets facilitate the visualisation of dead reckoning plots and the plotting and resolution of position lines from celestial observations.

Key Features of Mercator Plotting Sheets

• Three-Degree Coverage: Each sheet covers a specific 3° latitude band for precise regional plotting.
• Conformal Projection: Bearings on the chart correspond directly to compass bearings at sea.
• Dead Reckoning: Track vessel position between fixes using course, speed, and time calculations.
• Celestial Navigation: Purpose-designed for plotting sun, star, and planet observations with maximum accuracy.

Chart Presentation

• Chart Dimensions: The stated dimensions refer to the actual plotting grid size, which is printed on paper up to DE size (1070 x 715 mm) with a white border surrounding the image. This border can be trimmed if desired.
• Presentation: The chart will be printed from the latest file available. Sometimes this may be more up-to-date than the sample image on this page. If this is of concern please get in touch and we can check the latest thumbnail image.
• Official Markings: Charts will include an official agent's stamp and a line of authentication data in the margin.
• Folded or Unfolded: By default, charts are folded up to three times to a standard size suitable for a ship's chart drawer. If you require an unfolded chart, please select this option when ordering. Both folded and unfolded charts are then rolled for shipping in a tube.

Shipping and Handling

• Printed to Order: Please note that Admiralty charts are not off-the-shelf items. Each one is printed on demand by an official UKHO Print-on-Demand distributor and prepared individually, a process that involves printing, trimming, quality checking, folding, official stamping, and applying a chart number label to the back of the chart. Please check for messages regarding current handling times during the ordering process.
• Urgent Orders: If you are in a hurry, please get in touch with us directly and we will do our very best to accommodate your needs.
• Packaging: Your chart will be shipped rolled in a sturdy cardboard tube. Charts are produced to professional navigation standards where minor creasing, if it occurs, does not affect navigational use. If shipped with Royal Mail we use a standard round tube. If shipped with DPD we use a long rectangular box which carries a slightly higher risk of creasing. Minor creasing can usually be flattened easily with a few hours under some heavy books.
• Returns: Because every chart is printed to order, it is non-returnable unless faulty or damaged. Please ensure the chart you have selected meets your needs before ordering. We are very happy to help with any questions, so please get in touch if you need assistance.