The Great Lakes St. Lawrence Seaway System mashup tracks vessels navigating Great Lakes waterways.

The 76-foot Federal Kushiro docked at Cross Over Island last Thursday evening after traveling northeast on the St. Lawrence River for three hours.

The Federal Kushiro wasn’t alone; there were more than 20 ships on the St. Lawrence River that evening.

How can you tell? A mashup from the Great Lakes St. Lawrence Seaway System lets users track vessels navigating Great Lakes waterways in real time.

Click on show all vessels to see a list of ships in transit. The details are straightforward, but the acronyms can be a bit confusing. Here’s a list.

The interactive map also displays the region’s locks and ports. Click on the dots to get information on each port’s harbor master and web address.

The mashup focuses mostly on ships traveling through the various lock systems on Lake Huron, Lake Erie and the St. Lawrence River.

Both the United States and Canada manage the 2,300-mile seaway system. Depending on ice conditions, navigation season starts in late March and extends until late December, according to its website.

Win a prize if you’re the first to suggest or create a Great Lakes mashup used on Echo’s Monday Mashup. What’s the prize? Well, it’s not a Great Lakes cruise.  But  we’ll send you a token of thanks AND publicly acknowledge your contribution in MONDAY MASHUP. Send it to Monday Mashups editor Rachael Gleason at GreatLakesEcho@gmail.com.