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)

5.2.4.2.1  Levels.  No more than two brightness levels shall be used.

5.2.4.2.2  Brightness categories.  Track symbols with their modifiers and alphanumeric data shall be displayed at a higher brightness level than ground units, installations, control measures, and equipment symbols when simultaneously displayed.

5.2.4.2.3  Illuminance compatibility.  Symbol brightness (luminance) shall be compatible with the operator's visual tasks and illuminance environment.

5.2.4.2.4  Brightness control.  Operator control of symbol brightness should be provided.  Where such a control is provided, it should differentially dim the two brightness levels so that the brightness ratio between them is relatively constant.  If the display is to be used in an area with controlled ambient lighting, the minimum adjustment of the lower level shall be capable of providing display legibility under the highest ambient lighting anticipated.  A continuously variable rather than discrete control shall be provided.

5.2.4.3  Line structure.  Not more than six kinds of line structure coding shall be used to display symbols.  Those selected shall not preclude attaining required contrast and discrimination and shall conform to Figure 1.

5.2.5  Intercharacter spacing.  The horizontal separation between alphanumeric characters shall be from 20 to 50 percent of the character width.

5.3  Track, ground unit, and installation identifiers.

5.3.1  Track identifier location.  The first character of the track identifier shall be located in the second data space to the right of a target symbol, as shown in Figure

3.

5.3.2  Ground unit and installation identifier location.  The ground unit and installation identifiers shall be located as specified in Table VI.

5.3.3  Content.  Integration of air track, map and ground unit symbology should be displayed as shown by an air defense system display example given in Figure 4.

6.  NOTES

(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)

6.1  Intended use.  This standard is intended to specify requirements and guidelines for selection and use of symbols for depicting essential information in Army system displays.

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