When a ship crosses the Equator.
conmemorar
Coronation
On the contrary: The English politician and reformer, Samuel Plimsoll, devised the Plimsoll Line to prevent the overloading of ships. Ships float higher on salt water, and lower on fresh water. So the Plimsoll Line, painted on the bow of a ship, indicates the mark past which the ship must not pass - or it would be overloaded.
+ mark is used
Cargo
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the reason is to know how to separate your ships. to mark a ship from a distance, is very hard unless you have a flag.
The Plimsoll line is there for safety's sake. It's to prevent overloading of a vessel.The Plimsoll line or Plimsoll mark is named for the 19th Century Englishman Samuel Plimsoll, who first suggested that it was necessary to have permanent line or mark on the hull of merchant ships to show the depth to which a vessel may be safely and legally loaded. This "load" line differs from the waterline, which shows where the unloaded vessel floats. The Plimsoll mark is important because if it is submerged due to overloading, it immediately shows that the vessel does not have enough freeboard (that part of the vessel that is out of the water) to be safe.