A chart used to approach a harbor. See CHART CLASSIFICATION BY SCALE

Related Terms

ABSOLUTE TEMPERATURE SCALE

A scale of temperature measurement in which zero degrees is absolute zero.

API GRAVITY

A gravity scale established by the American Petroleum Institute and in general use in the petroleum industry, the unit being called 'the A.P.I. degree' .

CALCIUM

A scale forming element found in boiler feed water.

CHEMICAL CLEANING

Using a solvent solution to remove mill scale and corrosion products.

HYPSOMETRIC TINT SCALE

A graphic scale in the margin of maps and charts which indicates heights or depths by graduated shades of color.

SOFTENING

The act of reducing scale-forming calcium and magnesium impurities from water.

MULTIPLE TIDE STAFF

A succession of tide staffs on a sloping shore so placed that the vertical graduations on the several staffs will form a continuous scale referred to the same datum.

INDEX ERROR

The error in the reading of an instrument equal to the difference between the zero of the scale and the zero of the index. In a marine sextant it is due primarily to lack of parallelism of the index mirror and the horizon glass at zero reading.

LARGE SCALE

A scale involving a relatively small reduction in size. A large-scale chart is one covering a small area. The opposite is SMALL SCALE.

TARIFF

Terms and conditions and scale of charges.

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