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DWD marine barograph (photo Deutscher Wetterdienst)
The amount of the pressure tendency and characteristic of the pressure tendency in the past three hours is obtained from a marine barograph, preferably an open-scale instrument graduated in divisions of 1 hPa, or from an integrated electronic barometer-barograph with a digital output.
NOTE (supplementary and auxiliary ships only)

- Supplementary and auxiliary ships do not report the amount of pressure tendency and the characteristic of the pressure tendency