(a) training for any trick waterskiing element of a sporting event administered by a national sporting organisation approved under clause 2.1.3, or Maritime Rule Part 91.4(4); or (b) participating in a sporting event that is administered by a national sporting organisation approved under clause 2.1.3 or Maritime Rule Part 91.4(3). 2.2. Swimming and diving around wharves 1. No person shall dive, jump, swim or undertake other related activities, from: (a) the commercial jetties, wharves, or quays shown in Schedule 7; or (b) within 50 metres of the structures listed in 2.2.1(a); or (c) within any designated anchorage or mooring area; or (d) within any navigation channel; or (e) any such areas in the navigable waters of the region as the Harbour Master may from time to time determine, unless the person does so in accordance with the prior written consent of the Harbour Master. 2. The Harbour Master may issue an exemption to clause 2.2.1, subject to such conditions as the Harbour Master considers appropriate, in the interests of navigation. 2.3. Use of vessel engine around wharves, ramps 1. No person shall operate the propulsion system of a vessel while it is lying at any wharf, or while it is loading to or from a boat trailer at any launching ramp, in such a way that it may damage any property, scour the bed of the waters, or injure any person. This clause does not preclude the use of the propulsion system for the safe berthing or un- berthing of any vessel at a wharf. 2. In addition to the requirements of clause 2.3.1, a master of a commercial vessel shall ensure that a crew member shall: (a) be stationed forward and aft on any vessel while that vessel is lying at any wharf and about to test, or testing the main engine system; and (b) warn all persons or vessels in the immediate vicinity of that vessel that the engines are being tested; and (c) notify and seek permission from the Harbour Master prior to the engines being tested. 2.4. Vessels which are not seaworthy 1. The master of every vessel anchored or moored in any waters in the region must keep the vessel in a seaworthy condition at all times, unless the Harbour Master or Enforcement Officer has given prior written approval for it to be anchored or moored in a condition which is not seaworthy and subject to such conditions that the Harbour Master or Enforcement Officer may determine appropriate to ensure navigation safety. 2. If any vessel is a navigation hazard by reason of it being derelict or not being seaworthy: Page 12