Weather working day (WWD). This is defined in the Charterparty Laytime Definitions 1980 as: ". . . a working day or part of a working day during which it is . . . possible to load/discharge the cargo without interference due to the weather.

Without guarantee (W.O.G.) If a statement is made either during negotiations or in a charterparty and it is qualified with the words (or abbreviation) this indicates that the party using the qualification is not

WCCON (Whether Customs cleared or not). This phrase refers to the time when a notice of readiness can be tendered by the master of a vessel especially if the vessel has not reached its agreed destination if this is a berth (in a "berth charter") because this is unavailable.

Whether in berth or not (WIBON). This expression refers to the time when a notice of readiness can be tendered by the master.

Waybills. For ocean transport these can be called “Seawaybills” to distinguish them from commonly-used “Air waybills”.

War cancellation clause. The Institute War and Strikes Clauses (Hulls—Time) 1983 provide that:

WIFPON (Whether In Free Pratique Or Not). In a berth charter, notice of readiness can be tendered even if the ship has not arrived in the destination berth, which may be unavailable.

Working Time Saved (WTS). If the cargo operations are completed within the laytime allowed to the charterer, despatch can become payable to him. The despatch clause in the charterparty specifies how this despatch is to be calculated.

Working day. This is a day or part of a day which is not expressly excluded from laytime by the charterparty and which is not a holiday.

Whether in port or not (WIPON). In the English Court of Appeal decision in The Kyzikos, 1987, which dealt mainly with the phrase "whether in berth or not", it was said:

WWR. When and where ready.This abbreviation may indicate the availability of a vessel.

Waiver clause. This clause appears as part of the “Duty of Assured” in the Institute Time Clauses (Hulls) 1983. The waiver section states:

Weather permitting. (w.p.)(Wp) Sometimes cargo operations cannot be carried out because of inclement weather, especially when foodstuffs, such as grain, are being handled.

Warehouse to warehouse cover. Marine insurance for goods covered the period from port-to-port without any cover during transit to the loading port.

Washplate. In order to minimise the movement of fuel oil or water in partially filled tanks during heavy weather, thereby exposing the tanks to heavy strain, longitudinal washplates are fitted, thus reducing the free surface.