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A type of weather condition
A type of activity permitted in parallel with impaired hard controls
A replacement for control procedures such as PTW
A tool for vessel Masters to use in daily planning and during hard control failures (correct)

To replace control procedures such as PTW
To input activities on a vertical axis completing the matrix
To provide a quick reference of weather conditions
To restrict activities permitted in parallel with impaired hard controls or other conflicting activities (correct)

It consists of two axes with the horizontal axis containing the barriers (correct)
It consists of three axes with the barriers and activities input on separate axes
It consists of two axes with the vertical axis containing the barriers
It consists of one axis with barriers and activities input on the same axis