Also, look at:   Deposit	Charter Fee The amount of money you will need to pay to charter a yacht.  The charter fee does not include any optional extras (like a spinnaker, an outboard or skipper's fees).			related sites
Sidenote When an agency quotes the advance payment you will need to pay, this should be a percentage of the basic charter fee (i.e. 50%).  The extras -outboard, spi, skipper, etc.- may be paid upon embarkation