Unless sooner commenced (USC) - o ile przeładunek nie rozpoczął się wcześniej. Wtedy czas na przeładunek (rozładunek/załadunek - laytime) będzie liczył się od momentu faktycznego (wcześniejszego) rozpoczęcia przeładunku

Zwrót USC (Unless Sooner Commenced) powinien zostać po angielsku, bo to klauzula prawa morskiego/Gencon.

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Unless sooner commenced. Laytime usually begins as specified in the voyage charterparty, either immediately Notice of Readiness is properly and correctly tendered and accepted or after an express period following the tendering and acceptance of the Notice of Readiness. If the shipper is able to load or the receiver to discharge the cargo before the laytime commences he could do so without the charterer's losing any laytime. The Charterer thus obtains an unfair advantage of "free time": This can work against the shipowner, perhaps causing the latter to incur liability to pay despatch.

In the GENCON charterparty it also provides, near the end of the laytime commencement clause, that "Time actually used before commencement of laytime shall count". Depending on the negotiations for the charter, this clause can be- modified to show that time used counts as some fraction, say half, against laytime.

http://www.shipinspection.eu/index.php/home/k2-item-view/ite...

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UNLESS SOONER COMMENCED
Shall mean that if laytime has not commenced but loading or discharging is carried out, time used shall count against lay time.
http://www.marbrokers.com/charteringrule.html