Thank you @bunnypuncher. I do not know actually how marinetraffic is used by ships themselves. But, it is very helpful for me in tracking my husband's ship so I will know their location, estimated time of departure (ETD), estimated time of arrival (ETA) and many other useful information. Also, when I was working in an import-export company, we were using this site to track our shipment vessels as well so it has a great use commercially unlike before that only ship operators and vessel managers have access to this. But, there are risks for vessels especially for piracy so sometimes vessel captains intentionally hide their current locations and destinations if they will be passing through "high-piracy" areas. The sites on books are really great in keeping abreast with the new book releases and new releases from your favorite authors. :)