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Dew-point and relative humidity can be obtained from the readings of the air temperature (dry- bulb) and wet-bulb. If the wet-bulb reading is not available, dew-point and wet-bulb temperature can be obtained from the readings of the air temperature and relative humidity (if available)
NOTE (supplementary and auxiliary ships only)

- Supplementary and auxiliary ships do not report the dew-point, wet-bulb temperature and relative humidity