As the boating season is about to start vessels should not be berthed in the same harbour for longer than the statutory period of 5 consecutive days or more than a total of 7 days in any one month on the Shannon waterway, according to marine notice no 16 issued this week. Masters and owners are advised that the winter mooring period ends on Tues 31 Mar 2009 thereafter Navigation Bye-law No. 17(3) applies.