LOCOPIAS Manual Seagoing Vessels  2021
Loading Computer Software
Weight list
The [Weight list] has a crucial role in configuring a cargo loading condition because it offers an overview of all weight items of which the current loading condition consists. Weight items can be changed alphanumerically.

Menu bar functions

In the weight list window one can find the menu bar, which contains the ‘standard’ and ‘advanced’ functions. The standard functions are described in Common operations in modules. The specific functions [manaGe], [Database], [Loading tools], [check-displAce] and [Window] are discussed below.

Menu bar functions.

With [Manage] some visual formatting can be performed:

  • [Collapse weight groups]. In general, weight items belong to a particular weight group, a concept that is introduced in Menu bar. In LOCOPIAS subtotals of weights and COG of weight groups are always included in these weight lists. The individual items of a weight group can be obscured, that's what happens when the group is ‘Collapsed’
  • [Expand weight groups], the opposite of ‘Collapse’ which makes all items of a group visible. -[Move], to move a weight item in the weight list up or down. Highlight the row with the weight item to move to another position in the list. Now select the [Move] function. Highlight the row behind which the weight item is to be positioned, and select [move] again. The weight item is now in the new position.
  • [Quitmove], to abort an ongoing [Move] command.
  • [Sort], to sort the weight items along different sorting criteria, which are depicted in the figure below.

Different sorting methods for weight items.

Use this option to load standard weight items, such as ‘crew’, ‘stores’, etc. With this feature you can define a weight item once, and re-use them from this database when needed. Choose [Database]→[Edit database] from the menu bar to open [Database weight items]-window and edit weight items in the database. The option [Database]→[Read database] opens a window with a list of databse items, that can be selected in a loading condition.
Database of standard weight items.
Select from the database of weight items.
Loading tools

[Loading tools]→[Grain/Bulk] is subdivided in two sub-options. With [Choose holds] you can toggle the loading in the holds between breakbulk and grain. With [Place bulkheads] grain bulkheads can be placed. These commands are part of the grain functionality, which is discussed in Grain/bulk.

In order to simulate the actual loading condition in LOCOPIAS, the function [Check-Displace] can be used to see how well the real (=observed) and simulated displacements are approximating each other. You can enter the real-life draft marks and compare them with the calculated draft marks and check the displacement difference. A correction weight can be added to the weight list to achieve the real displacement.

There are a few options available:

  • [Fill hopper(s) to maximum draft], filling the cargo and water in the hopper(s) so that the ship lies exactly at its dredging draft.
  • [Justify overflow height(s)], Some ships have height-adjustable overflows. As a rule, a certain actual position of the overflow will be determined automatically, e.g. with the previous function. However, if you want to manually give the overflow position, you can do so with this function.

Window, Result windows
With this function one of the floating result windows — as introduced in Operation of LOCOPIAS and general functions — can be opened, such as for intact stability or for longitudinal strength.

Content of the weight list

Columns in the [Weight list] that require explanation are discussed below.

Modifications for the whole weight group can be easily applied via modifing the appropriate value on the sub total line. Possible modifications are: ‘FSM type’, ‘Weight group’, ‘Tank filling’ and ‘Density’. Do note that with ‘undo’ it is possible to restore the modification.
List of weights of a loading condition.
This column displays the name of the weight in the row. This column can help by separating certain weights.
Gives information about the type of weight.
Weight in tonnes.
Vertical center of gravity in meters, related to the baseline.
Longitudinal center of gravity in meters, related to the aft perpendicular.
Transverse center of gravity in meters, related to the centreline.
This column shows the Free Surface Moment for predefined tanks or for a user-defined weight of a fluid in metric tonnes multiplied by a distance in meters. It is possible to override this standard free surface moment using another free surface option under FSM Type.
FSM Type
With this function you can select the type of free surface moment (FSM) calculation. By default the free surface moment is computed for the actual tank level. Occasionally, the IMO Intact Stability Code may require a different method, so you can choose from the following alternatives:
  • Maximum FSM which occurs anywhere in the tank.
  • Zero in case the filling is more than 98%.
Please note that LOCOPIAS also offers a more advanced method to compensate for free liquid effects, which is the “actual shift of liquid method”. If your LOCOPIAS is configured this way, it will compute the real movement of liquid, including the effects of heel and trim, which overrides the conventional FSM setting as elaborated here.
Weight group
Each weight item may be assigned to a weight group. The name of the group is displayed in this column. If you want to show the difference between weight groups even more clearly, in the menu bar on the [Main screen], under [Edit]→[Edit Weight Groups] you can edit the name and text color of each weight group. This name and color also becomes visible in the overview of weight groups (See 7 in Main window layout of [Main screen]).
Aft & Fore
These columns contain the forward and aft boundaries of a weight item. These boundaries are required for longitudinal strength calculations only. The distances are given in meters and refer to the aft perpendicular. The weight distribution is a linear function determined by the longitudinal center of gravity and the position of the boundaries (More information on this subject can be found under LCG and weight distribution of weight items).


Click the [Check]-button to check if the loading condition complies with the stability and strength requirements. After clicking the Checkbutton, a window opens with several tabs: ‘Overview’, ‘Stability’, ‘Air draft’ and ‘Strength’. Damage stability is optional. More information about the [Check]-button can be found in Check.