MIL-STD-1477 Symbols for Army System Displays MetricThis standard prescribes the physical characteristics of ground and air track symbols, unit/installation symbols, control measures symbols, equipment symbols, and associated alphanumeric information for U.S. Army Combined Arms system displays which are generated by electronic, optic, or infrared technology and presents information in real time or near-real time.

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MIL-STD-1477C(MI)

5.2.1.6  Equipment.  The major dimension of equipment symbols shall subtend a visual angle of not less than 7.3 mrad of arc  nor more than 16.0 mrad of arc when measured from the operator's eye in its normal viewing location.  The size stated is for equipment symbols used independently and not integrated with unit or installation symbol.  When equipment symbols are integrated with unit or installation symbols, the equipment symbols should be sized to fit into the unit or installation symbol.

5.2.1.7  Multiple tracks.  The symbol formed by the inner line shall be the same size as the single track symbol.  The outer line shall be separated from the inner line by no less than one stroke width of the line.

5.2.1.8  Landmark symbology.  The major dimension of the landmark symbol shall subtend a visual angle of not less than 7.3 mrad of arc nor more than 10.2 mrad of arc when measured from the operator's eye in its normal viewing location.

5.2.2  Symbol width.

5.2.2.1  Track symbols.  The width-to-height ratio of the basic track symbols depicted in Table I shall be 1:1.

5.2.2.2  Ground unit symbols.  The width-to-height ratio of ground unit symbols depicted in Table V should be approximately 3:2.

5.2.2.3  Installation symbols.  The width-to-height ratio of installation symbols depicted in Table V shall be 1:1.

5.2.2.4  Control points and equipment symbols.  The width-to-height ratio of control points and equipment symbols depicted in Tables XIII, XX, and XXVI should be approximately 2:3.

5.2.3  Symbol stroke width.  The stroke width-to-height ratio of light symbols on a darker background should be not less than 1:6 nor more than 1:10, inclusively The stroke width-to-height ration of dark symbols on a brighter background should be not less than 1:6.

5.2.4  Lines.

5.2.4.1  Line width.  The basic line width used to compose battlefield geometry symbols shall subtend a visual angle of not less than 1.2 mrad of arc when measured from the operator's eye in its normal viewing location.  The equation shown in 5.2.1 may also be used to determine the appropriate line width, substituting line width for symbol height.

5.2.4.2  Line brightness.

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