Ocean power in New Zealand speed. Because the tidal speed doubles, eight times more tidal power can be produced at spring tides than at neap tides. The entrance to Kaipara Harbour, one of the largest harbours in the world, is a channel to the Tasman Sea. It narrows to a width of , and is over deep in parts. On average, Kaipara tides rise and fall . At high tide, nearly 1000 square kilometres are flooded. Spring tidal flows reach 9 km/h (5 knots) in the entrance channel and move 1,990 million cubic metres per tidal movement or 7,960 million cubic meters daily. In 2011,
Convention Relating to the Distribution of Programme-Carrying Signals Transmitted by Satellite Convention Relating to the Distribution of Programme-Carrying Signals Transmitted by Satellite The Convention Relating to the Distribution of Programme-Carrying Signals Transmitted by Satellite was opened for signature on 21 May 1974 in Brussels and entered into force on 25 August 1979. It is overseen by the United Nations Committee on the Peaceful Uses of Outer Space. Convention provides for the obligation of each Contracting State to take adequate measures to prevent the unauthorized distribution on or from its territory of any programme-carrying signal transmitted by satellite. As of 2014, the convention has been ratified by 37 states; there are 10