If away from base and the rest period earned is 12 hours then the rest may be reduced by up to one hour, provided suitable accomodation is provided and the travel time between the accommodation and the reporting point is less than 30 mins. If the travelling time is more than 30 mins then the rest must be increased by the amount the journey exceeds 30 mins.This is not discretion and may be rostered. However, if the rest period earned is more than 12 hours then the rest can only be reduced at captains discretion