Abstract
This paper presents a framework for measurement of discrimination on navigation light marks at night. It is assumed in this model that a degree of discrimination of a pair of two navigation marks is affected by three kind of attributes: the intensity of illumination, the light patterns and the angle between the marks. It is sufficient to identify at least three navigation marks in order to estimate an observer's position without side information. Therefore, the second largest degree of discrimination among all the pairs of marks is a dominant factor. The measurement is available for the evaluation of planning of navigation marks, maneuvering environment and so on.
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