IA 2

Chart Number, Title, Marginal Notes IA

Magnetic Features —» IB    Tidal Dała —> IH    Decca —> IS

@ Chart number in the Admiralty series. Where it is necessary to distinguish Admiralty charts from others, it is usual to add the prefix 'BA'    251

(British Admiralty) to the number.

603

251.1

252.1 252.4

253

252.2

252.3

222.3

222.4

232

241.3 242

241.1

241.2

211

241.4

221

221.1

242

170-178

241.9

(2) Identification of a latticed chart (ifany). Charts for which Decca lattice-overprinted versions are available bear the letter V in the lower right-hand corner inside the outer border. The lattice prefix number is shown against the national number.

@ Chart number in the International (INT) Chart series.

"w Publication notę (imprint) showing the datę of publication as a New Chart.

(5) Copyright notę. Ali Admiralty charts are subject to Crown Copyright restrictions.

'JS) Dates of (a) New Editions and (b) Large Corrections (abandoned as a revision category in 1972).

0) Smali corrections: (a) the year dates and numbers of Notices to Mariners and (b) the dates (usually bracketed) of minor corrections included in reprints but not formally promulgated (abandoned as a method of correction in 1986).

Dimensions of the inner neat-lines ofthe chart border. In the case of charts on Transverse Mercator and Gnomonie projections, dimensions may be quoted forall borders ofthe chart which differ. Fathoms charts show the dimensions in inches eg (38.40x 25.40).

4 Corner co-ordinates.

10) Chart title. This should be quoted, in addition to the chart number, when ordering a chart.

11, Explanatory notes on chart content; to be read before using the chart.

T?) Seals. Where an Admiralty chart is in the International Chart series, the seal of the International Hydrographic Organization (IHO) is shown in addition to the national seal. Reproductions of International charts of other nations (facsimile) have the seals of the original producer (left), Publisher (centre) and the IHO (right). Reproductions of other charts have the seals of original producer (left) and publisher (right); charts which are co-productions carrythe seals ofthe nations invotvedin theirproduction.

/r~x

3 Scalę of chart; on Mercator projection, at a stated latitude.

(14)    Linear scales on large-scale plan.

(15)    Linear border scales (metres). On smaller-scale charts, the latitude border should be used to measure Sea miles and Cables.

(16)    Cautionary notes (if any) on charted detail; to be read before using the chart.

-O

Source Diagram (if any). If a Source Diagram is not shown, details of the sources used in the compilation of the chart are given in the explanatory notes (see 11). The Source Diagram or notes should be studied carefully before using the chart in order to assess the reliability ofthe data used.

■ (18)    Reference to a larger-scale chart or plan.    254

(10    Reference to an adjoining chart of similar scalę.    254

(20)    Instruction to refer to related Admiralty Publications.    243

@    Reference to the units used for depths measurement. The legend, 'DEPTHS IN FATHOMS¹, is shown on certain morę recent fathoms charts where    241.5

confusion might otherwise arise.    ^{255 2}

® Conversion scales. To allow approximate conversions between metric and fathoms and feet units. On older charts, conversion tables are given    280

instead.

© Copyright Notice

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