A sea trial or trial trip is the testing phase of a watercraft (including boats, ships, and submarines). It is also referred to as a shakedown cruise.That is the way it works. A sea trial is done to check the performance of the diesel inboard and other systems, like the inmast furling, should the boat be so equipped. A sea trial is the marine equivalent of a test drive, crucial for assessing a vessel's performance before it is fully commissioned or sold. Sea trials are an important step within the boat buying process that allows you to take a boat for "test run. Notice No. 1 (effective on 1 July 2018) to the 2018 Rules, is summarized below. (3) The Contractor shall provide and install all fittings and appliances necessary for dock and sea trials. Sea_trial_procedures - Free download as PDF File (. We understand the importance of performance and reliability at sea.