Also, look at:	Charter contract A legal and enforceable agreement between two or more parties.  A charter contract is usually signed by 3 parties: the client (charterer), the boat owner and an agent in-between.			related sites
Sidenote In some countries the contract (charter agreement for self-sail charters) is issued from the Government (e.g. in Greece, where all companies/owners are obliged to use this contract), when in others -like in Turkey or the Caribbean-, every company is using its own legal document.