A cargo ship from the Atlantic Ocean passes through the Strait of Gibraltar, the Mediterranean Sea to the Red Sea, and finally to Calcutta, India, with short days and long nights.

The cargo ship is in the northern hemisphere, and the days are short and the nights are long, indicating that it is winter now.

From the Atlantic Ocean to the Mediterranean Sea via the Strait of Gibraltar, the salinity of the Mediterranean Sea is high, and the density flow from the Atlantic Ocean to the Mediterranean Sea is smooth. Similarly, the direction of ocean currents from the Mediterranean to the Red Sea is obtained.

In the Indian Ocean, because it is winter, the wind in winter is always counterclockwise, so it is against the wind.

To sum up, this cargo ship should be sailing before sailing.