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The above viewport presentation applies the viewport icon on the toolbar to make 2x2 connected viewports with different background color. Then each viewport is selected for displaying its appropriate cube. A cursor point is set within the cube using the keyboard letter p. Then the command Cursor view>Map X Y Z pales at cursor position* is executed for each cube. The shell command tx2 lle col bla txt "text" was used for displaying a bottom text.
Using base grid datum to minimize cube size
Sometimes the cube spans over a large area going from shallow water near land to deep water far out in the sea. In that case it is suitable to use the seabed as a base grid datum to minimize the cube grid size.
Read more about this feature in the article Time - velocity cube with base grid datum.