Heading
From Memory Alpha, the free Star Trek reference
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Heading is an expression of the direction a space vessel is traveling in relation to the center of the galaxy. It is composed of two numbers: an azimuth (horizontal) value and an elevation (vertical) value, separated by the designator "mark". For example, a heading of 180 mark 0 would be a course heading to the outer rim of the galaxy, but on the same elevation as the center of the galaxy.
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