(1) At any time between the vessel entering the port and leaving its Berth at the port, at the request of the Company or its agents, the Master of a vessel must deposit with the Company an amount estimated by the Company as being the berthage dues and towage and wharfage rates and miscellaneous charges which will be incurred by that vessel in entering and leaving the port and in lying alongside the Berth, but the Company in its absolute discretion may accept in lieu of such deposit a written guarantee from the agent for the vessel as set out in Schedule 1 Part 5.

(2) The Company must use any moneys deposited with it in accordance with sub-bylaw (1) towards payment of any dues, rates and charges incurred in respect of that vessel.

(3) All dues, rates and charges must be paid before the vessel, in respect of or in connection with which they are charged or payable leaves the Berth, except that where the Company has accepted a guarantee pursuant to sub-bylaw (1) the vessel may subject to the provisions of Part 5 leave the Berth prior to such payment being made.

(4) The Marine Manager may detain any vessel in respect of which ¾

(a) the dues, rates and charges or a guarantee referred to in sub-bylaw (1) has not been paid or given; or

(b) a guarantee has been given on a previous occasion, the terms and conditions of which have not been observed.