SMALL-CKAFT CHAJRT8 91 



Small-craft Charts 

 GENERAL SPECIFICATIONS 



FORMAT DIMENSIONS: See page 90. 



A PLANNING LAYOUT shall be made on a pre-determined format, showing the limits, 

 title, and scale of the base chart and the insets. Space permitting, selected photographs of 

 pertinent features within the charted area will be employed. 



MERCATOR PROJECTIONS, based on the middle latitude of the chart, shall be computed 

 and ruled for the base chart and insets. Projection and subdivision intervals are determined 

 by the chart scale. 



LINE WEIGHTS: See page 96. 



SOURCES shall include aU the latest information as to : 



1. Hydrography] 



Standards 



2. Topography . 



3. Photography 



4. Aid Proofs 



5. Coast Pilot 



6. Geographic Names Standards 



7. Notice to Mariners 



8. Facilities (Services and Supplies) 



When source material has been evaluated, a graphic index shall be made of aU the data 

 to be used in the chart. For compilation, this source material is then reduced or enlarged 

 photographically for fidelity of detail and scale. All data used during compilation and review 

 must be recorded on the History Sheets. Marine Weather information, Tides, Currents, 

 and all other notes concerning the chart and insets should be selected and revised, if neces- 

 sary. Modernized wording should be used whenever possible. 



FACILITY information is obtained by a facility inspection survey. The facility positions 

 are plotted on the largest scale charts, T-sheets, or quads covering the SmaU-craft Chart 

 area and described as Facility Standards. Information for individual facilities shall be 

 assembled and transferred to the facility index forms. Field mmibers designate the indi- 

 vidual facilities imtil aU facilities have been plotted on the base charts and insets. A number 

 is then assigned and applied to the red or magenta compilation in bold type with a leader 

 to its exact position. The facilities are listed consecutively within the Facility Index and 

 placed on the cover whenever possible. Facility tabulations are revised in each new edition 

 of the chart. 



