The Merge Boxes command is used to merge adjacent shoal boxes into a single box. Shoal merging might be done if:
• The Automatic shoal merging and subdividing option was not used during shoal detection.
• A shoal was not merged during detection because it did not meet the criteria.
To merge shoal boxes:
1. Select the Shoal Boxes layer in the Layers window.
When selecting the shoal boxes to be merged, there are certain criteria that must be met:
• The shoals cannot have been registered.
• The shoals must belong to the same group.
• The boxes must be adjacent to each other (touching).
2. Select the shoal boxes in the Display window that you want to merge.
3. Select the Merge Boxes command.
Menu | Tools > Engineering Analysis > Shoals > Merge Boxes |
Tool |
|
The Merge Boxes dialog box is displayed.

When the shoals were detected, a specific reference model was used to determine reference depth and orientation. The same station catalogue must be used when working with the shoals. By default, the last selected station catalogue will be selected in the dialog box.
The reference model file must be open when grouping the shoal areas in order for the list of station catalogues to be populated. |
4. Ensure that the correct Station catalogue is selected from the drop‑down list.
5. Click OK.
The shoal boxes are merged into a single box.

If necessary, the Undo command can be used to reverse the merge if the changes have not been saved. For more information, see the Undo topic in the CARIS BASE Editor Reference Guide. Also, if the shoal boxes are reoriented, the merge will automatically be undone as it will no longer be applicable.