As the computer technology grows rapidly day by day. now it is very simple and convenient to get the vessel's positions.
the position resource is from AIS(Automatic identification System).
there are two main software in Chinese Market, as flwg.
https://www.hifleet.com and http://www.shipxy.com
such as the flwg sample, input mv yu peng from Da Lian Maritime University, which can get the flwg information.