The Yangtze River Maritime Safety Administration started the global position system (GPS) to monitor 107 passenger ships sailing in the Three Gorges enveloped
by a dense fog.
It ordered the ships to stop and wait by sending short text messages after the fog became too dense for sailing.
's Spring Festival travel season started three days ago, 50,000 passengers have safely traveled in and out of the Three Gorges.
The upper reaches of Yangtze River, China's longest, have been hit by extreme dense fogs recently.
As a measure of preventing sailing accidents, maritime authorities equipped passenger ships in the river with GPS facilities
free of charge.
Knowing the location of each ship, the authorities can easily monitor and manage the sailing in the river. Once a ship is engaged in dangerous activities such as sailing at night, the monitor system will give an alarm to the authorities.
Most of the traffic in Yangtze River during the Spring Festival holiday season will take place in the Three Gorges, as 580,000 passengers will be transported by 160 ships.