Hyundai Samho Heavy Industries is said to have inked an order for two 9,000-teu containerships from a Singapore-based shipowner.
An isophase light flashes at regular intervals, the duration of light being equal to the duration of darkness. Light phase characteristics are the distinctive sequences of light and dark intervals or sequences in the variations of the luminous intensity of a light. The light phase characteristics of lights which change color do not differ from those of lights which do not change color. A light showing different colors alternately is described as an alternating light. The alternating characteristic may be used with other light phase characteristics.
Light-sensitive switches extinguish most lighted navigation aids during daylight hours. However, owing to the various sensitivity of the light switches, all lights do not come on or go off at the same time. Mariners should account for this when identifying aids to navigation during twilight periods when some lighted aids are on while others are not.