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Ship Stability - Curves of Statical Stability

Load Line requirements for minimum stability conditions

Ship Stability - Movement of the Centre of Gravity

Centre of gravity

THE GZ CURVE OR CURVE OF STATICAL STABILITY A typical plot of GZ against angle of heel is shown here.

Ship Stability - Displacement

Mass, Weight, Force and Gravity

You can use this Draught Survey program for free. It has no passwords. This program has been used for many years.

Handling characteristics will vary from ship type to ship type and from ship to ship. Handling qualities are determined by ship design, which in turn depends on the ship’s intended function. Typically, design ratios, such as a ship’s length to its beam, determine its willingness to turn.

Remember that the evidence relating to the incident is likely to be found on board the ship and that this evidence will be needed by the Club to defend claims which are received from injured persons, the owners of damaged cargo or property, or from a terminal operator.

Draught surveys – practice

Where the authorized officer so directs, or where the master is required to make a report under Regulation 13 (see Preparations for health clearance in Section H), no person other than the pilot, a customs officer, or an immigration officer, may, without the permission of the authorized officer, board or leave a ship until free pratique has been granted, and the master must take all reasonable steps to secure compliance with this requirement.


Advantages vary from one FOC register to another but often include the following: 

A vessel is stranded when she is aground and cannot refloat without assistance.

“+”(properly called a Pattee cross but often called a Maltese cross) means the ship was constructed under survey by Lloyd's Register surveyors; "100" means the ship is suitable for seagoing service. "A" means the ship was constructed or accepted into LR class and is maintained in good and efficient condition. "1"means she has good and efficient anchoring and mooring equipment.

Timesheets and Laytime calculation. After a fixture has been made and the vessel has commenced performance of the charter, "post-fixture activities" become important.


Note: Content was contributed by our readers. 



Fresh water allowance or FWA. This is the change in draught of a vessel when it moves from salt water (density 1.025 tonnes/cu.m) to fresh water (1 tonne/cu.m). The FWA for a vessel for a draught at or near the summer loadline can be calculated by the formula:

Displacement / 4 x TPC

where, TPC = the tonnes per centimetre immersion.


Cancelling date (Laycan). This is an abbreviation for the "Laydays and Cancelling" clause in a charterparty. This clause establishes the earliest date, when the ship is required by the charterer, (e.g. "Laytime for loading shall not commence before . . .") and the latest date for the commencement of the charter (e.g. “ . . . and should the vessel's Notice of Readiness not be given before . . . ") when the charterers have the option of cancelling the charter.

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