On/Off hire survey. When a ship commences a time charter it is said to be "delivered" to the Charterer.
Overstowing. A clause in a charterparty may allow either the charterer or the owner to load cargo over the original cargo, if there is available space and deadweight capacity available. However, overstowing may cause problems with the time for discharge of the original cargo as occurred in the case of The Mexico I, 1990. Overstowing by the owner may also lead to claims if the cargo beneath is damaged.
Open registry. This is a system whereby a country may allow ships to be registered there and fly the country's flag without the real owner having any definite connection with the country. The phrase is similar to "Flag of Convenience" but that phrase is more often used in a critical manner, for example by the ITF.