Modification of NSF'2012 1.In both editions,buyers and sellers can choose either dry dock survey or in water survey.But if they do not make choice,then dry dock survey is given priority in 1993 edition,while in water survey is given priority in 2012 edition. Reason:the number of ports that can carry on dry dock survey is decreasing,and there is often no dry dock available unless waiting for a long time. 2.In 2012 edition,if in water survey is chosen "such option shall be declared latest 9 days prior to clause 5(b)of this agreement", which means,the buyer need to inform the seller to prepare for in water survey at least 9 days before. Reason:for fear that seller don't have enough time to arrange for the survey,and the buyer need to exercise the right in time.1. In both editions, buyers and sellers can choose either dry dock survey or in water survey. But if they do not make choice, then dry dock survey is given priority in 1993 edition, while in water survey is given priority in 2012 edition. Reason: the number of ports that can carry on dry dock survey is decreasing, and there is often no dry dock available unless waiting for a long time. 2.In 2012 edition, if in water survey is chosen "such option shall be declared latest 9 days prior to clause 5(b) of this agreement" , which means, the buyer need to inform the seller to prepare for in water survey at least 9 days before. Reason: for fear that seller don't have enough time to arrange for the survey, and the buyer need to exercise the right in time. Modification of NSF'2012