You can use OBC pre-cruise to reserve Azamara Shore Excursions before boarding up until two days prior to their voyage.
After boarding you can use your onboard credit to purchase more shore excursions, at which stage the balance of your OBC reverts to $US. It may also be used for upgraded beverages, Internet, specialty dining, spa and shops.
Pre-cruise, reservations booked in other currencies will display the current exchange rate to $US. This will fluctuate weekly until the first payment is made for shore excursions using some of the OBC. At that point, the exchange rate will be locked in for future purchases on that booking.
Azamara generated OBC has not been able to be used to purchase future cruises, either deposits or payments.
Any unused Azamara generated OBC goes back in to Azamara's bank. It cannot be cashed out - use it or lose it.
However if you have OBC from a Travel Agent (not Azamara generated) any unused portion of that is refundable.