| ACRONYM | FULL WORDING | COMMENT |
| W/M | Weight of Measurement | Used about the assessment of the freight, per ton or per cbm |
| WB | Water Ballast | |
| WCCON | Whether Custom Cleared Or Not | All these expressions have the purpose to allow the remittance of the NOR when the berth / the port is/are congested.Their interpretation is not uniform all around the world |
| WECHON | Whether Entered at Custom House Or Not | All these expressions have the purpose to allow the remittance of the NOR when the berth / the port is/are congested.Their interpretation is not uniform all around the world |
| WIBON | Whether In Berth Or Not | All these expressions have the purpose to allow the remittance of the NOR when the berth / the port is/are congested.Their interpretation is not uniform all around the world |
| WIFPON | Whether In Free Pratique Or Not | All these expressions have the purpose to allow the remittance of the NOR when the berth / the port is/are congested.Their interpretation is not uniform all around the world |
| WIPON | Whether In Port Or Not | All these expressions have the purpose to allow the remittance of the NOR when the berth / the port is/are congested.Their interpretation is not uniform all around the world |
| WLTHC | (Distance) Water Line / Top of Hatch Coaming | This distance is measured when the vessel is fully ballasted / without cargo. It allows to check whether the vessel can get under the loading apparatus or leave the discharging apparatus without difficulty. |
| WOG | Without Guaranty | |
| WP | Weather Permitting | It means that the laytime counts unless the weather conditions actually prevent loading or discharging. However this interpretation has been recently changed by english judges and interpreted as WWD below |
| WT | Wing Tanks | |
| WVNS | Within Vessel’s Natural Segregation | |
| WWD, WW Day | Weather Working Day | Means that the laytime counts unless the weather conditions have or would have prevented loading or discharging whether the vessel is at work or not. |
| WWR | When and Where Ready | Used to specify the place and the time of the delivery of the vessel under T/C |
| WWWW | WIBON+WIFPON+WIPON+WECHON (WCCON) | Whether the vessel is in berth or not, in free pratique or not, in port or not, entered at custom house or not |
