допоміжна горизонталь; гіпотетична / наближена горизонталь; чверть горизонталі
contour line (contour)
approximate adjustment fire
approximate aiming
approximate target
Approximate total number of flights
adjacent contour
contour
contour interval
depth contour
index contour line (cart.)
intermediate contour line
supplementary contour
barrel contour
Functional Hardware and Software Contour (FHSC)
wing contour
contour chart
contour flying
contour line
contour search
terrain contour matching (TERCOM, TERRCOM)
depression contour