Most commercial vessels are now mandated to carry an automatic identification system known as AIS. Leisure craft can decide to fit an AIS if they wish. This enables vessels to easily identify one another and to see each other's course and speed. The information is available on the internet from a number of providers including marinetraffic.com whose map for our area is shown below.
The display automatically refreshes at an interval of 10mins. It can also be manually updated by clicking the refresh icon on the sidebar. However, the currency of the data of each individual target depends on how often the target itself refreshes its data.