
Waterline
Load Indicator
On ships, 'waterline' indicates how heavily a vessel is loaded.

The cargo was heavy, bringing the ship closer to the waterline.
Safety Marker
Below the waterline is critical for ships as breaching it can threaten buoyancy.

During the inspection, they ensured no holes were below the waterline.
Structural Boundary
The waterline separates the underwater hull from the above-water superstructure.

The waterline is clearly visible, differentiating the red hull from the white deck.
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