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)

3.5  Track.  A graphic symbol, along with applicable symbol modifiers, of any space, air, land, surface, or sub-surface vehicle which has been detected and processed by a sensor system and electronically displayed, in real time.

3.6  Unit.  Any military element of personnel and equipment whose structure is prescribed by competent authority, specifically, part of an organization.

4.  GENERAL REQUIREMENTS

4.1  Standardization.  Symbols used in the U.S. Army systems shall be consistent and uniform for common functions where symbols are used to display functions for the soldier-machine interface.  Such Army systems include:  Maneuver Control, Air Defense, Air Support, Intelligence and Electronic Warfare, and Combat Service Support, plus those systems used in the command, control, and interoperability of the battlefield systems.

4.2  Symbol categories.  Symbols defined in this standard are presented and utilized in two tactical operational categories:  engagement operations and force operations.  Symbols for engagement operations shall use shape coding for identification and symbols for force operations shall use an alpha designator for identification.  Color coding shall be used as a redundant method for both engagement and force operations symbols.

4.3  Basic symbol design.  Unless otherwise required by operational consideration, symbol shapes shall use open rather than filled structures (e.g., "O" rather than "  ") to provide space for effective integration of various modifiers.

5.  DETAILED REQUIREMENTS

5.1  System coding.  Where visual discrimination between signals may be critical to human and system performance, symbols shall be appropriately coded. Coding techniques shall include shape, line structure, modifier, blinking, reverse video, and color.  A symbol luminance of not less than 0.34 cd/m2  and a luminance contrast ratio of not less than 0.88 should be maintained.  Symbols should be designed for use from a viewing distance of not more than 0.5m.

5.1.1  Symbol shapes and modifiers.

5.1.1.1  Tactical engagement operations applications.

5.1.1.1.1  Basic tracks.  Basic track symbol shapes shall conform to Table I.

5.1.1.1.2  Track modifiers.  Standard modifiers to track symbols shall conform to Table II. Modifiers to track symbols include multiple tracks, engageable or

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