These extra expenses are the provisioning for guests, the fuel costs, mooring fees etc. Usually it is 30% of the charter price and all items are specified in an Addendum attached to the charter contracts providing breakdown analysis of the cost. Final accounts will be presented by the Captain at the end of the charter and any unused funds will be refunded in total to the Charterer. If the funds are not sufficient, the Captain will advise you accordingly and bills will be settled upon disembarkation.