I like the simplicity of the symbols. They really are international and it's interesting to see how they all have a clear purpose. 1. White rectangle above red

I like the simplicity of the symbols. They really are international and it's interesting to see how they all have a clear purpose. 1. White rectangle above red rectangle with yellow borders: Pilot, please board here to guide us into the harbor. 2. Horizontal line through a circle: You should see this line above the water, otherwise the ship is overloaded. 3. Sketch of a bulk under water: Be careful, this ship has a bulbous bow that might be beneath the water surface.