Before calculating your draft survey, cargo loaded or discharged, or any computation related to Trim and Stability, first find the water density where your ship is floating. Take a sample amidship at least 1.5 to 2 meters deep.
Remember:
=Freshwater: 1.000 t/m³
=Brackish/Dockwater: 1.001 to 1.024 t/m³
=Saltwater: 1.025 t/m³
Any density that is above saltwater density or below fresh water density is considered "extreme water density" like for instance some areas in Panama Canal had 0.9954 t/m3 while Red Sea had a density of 1.032 t/m3 and higher.
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