All qualified bookings made during this period will automatically be eligible for our Onboard Value Booklet (one per guest, max of 2 per stateroom). Our booking system will know automatically when to apply the OVB- beginning on the first day of the sale, terminating on the last day of the sale. OVB applies only to bookings made during sale dates. The Onboard Value Booklet is combinable with most fare types, including GAP group rates. There are a few restrictions: certain promotional fares/groups such as Flash Fares, Community Appreciation fares are not combinable. Check with reservations for combinability questions. Grand Voyages and Incentive Groups are also excluded.