Great Lakes Vessel Tracker: Follow Ships Live
In this article 12 sections
Great Lakes Vessel Tracker: Follow Ships Live
Use the MarineRadar Great Lakes vessel tracker to see where a ship is on a live map right now
A thousand-foot freighter slides past the lighthouse and the whole beach goes quiet for a minute. Then somebody asks the obvious question: what ship is that, and where is it headed? A Great Lakes vessel tracker answers both in about the time it takes to unlock your phone.
This guide shows how to use MarineRadar as a Great Lakes vessel tracker. You will see which ships turn up on the map, which stretches of water are worth watching, how to follow one freighter from dock to dock, and why a ship that looks stuck is usually just waiting its turn. If live tracking is new to you, our beginner’s guide to live ship tracking covers the basics first.
What you will see on the map
Zoom in on the lakes and you are looking at a chain of five: Superior, Michigan, Huron, Erie and Ontario, tied together by rivers, straits and canals. Traffic follows that chain. Most icons are bulk freighters, the long, narrow ships locals call lakers, carrying iron ore, limestone, coal, grain, cement and salt. You can read more about how cargo ships differ in size and type in our separate guide. Around them you will find tugs, ferries, patrol vessels and now and then an ocean-going ship that came up the St. Lawrence Seaway.
Tap any icon and its page opens with the name, IMO number and MMSI, type, position, speed, course, heading, destination and ETA, plus draft and dimensions. Nothing needs switching on first. If you want the history of the fleet and who runs it, our guide to tracking ships on the Great Lakes covers that. This page is about using the tracker.
A lake-by-lake watch list
Lake Superior is where the iron ore starts. Duluth-Superior and Two Harbors are loading ports, so you can watch a ship arrive riding high and leave sitting low.
The St. Marys River and the Soo Locks are the gate between Superior and the lakes below it. Almost every laker heading down from the head of the lakes passes through here, which makes it the best single place to open the map.
Michigan and Huron are joined at the Straits of Mackinac. A ship crossing under the bridge is moving between the upper lakes and the lower ones.
The St. Clair and Detroit Rivers are narrow and busy, and ships pass close to both banks. Positions refresh often here, and the traffic is easy to read. That is because land-based receivers cover most of the lakes, which our explainer on terrestrial versus satellite AIS unpacks.
Lake Erie leads east to the Welland Canal, which lets ships climb around Niagara Falls into Lake Ontario. From there the Seaway runs on toward the Atlantic. If you want to look up the harbours along the way, the ports directory lists them.
Follow one ship, step by step
First, get a name. Freighters wear theirs in huge letters on the bow, so if you saw the ship you already have it.
Second, type it into the search bar in the MarineRadar app or on the live web map. An IMO number or MMSI works too, and it is the safer choice when two names look alike. Here is why the IMO number matters for tracking.
Third, check the type on the result. It should read cargo for a freighter. A few names are reused by small unrelated boats, so a quick glance saves confusion.
Fourth, read speed and course instead of just the pin. A ship holding a steady speed on a straight heading is under way. One that has nearly stopped outside a river mouth is probably queuing.
Fifth, treat the destination as a hint. The crew types it in, and it is not always updated between port calls.
Sixth, add the ship to My Fleet so it is one tap away next time.
No name? Scan the water instead
Plenty of people start from the shoreline with no idea what they are looking at. Two tools help.
Vessel labels put text next to every icon. Open Map options, make sure Vessels is on under Display on Map, then open the Vessel Label Display card. Pick Name and every ship announces itself. Pick Speed to see who is moving and who is waiting.
Ships Near Me lists the ships around you, nearest first. Open the Tools menu, tap Ships Near Me, allow location access, and choose a radius of 5, 10, 25 or 50 nautical miles. From a beach or a breakwall, 5 or 10 is usually plenty. It is free.
Why a ship can look stuck
The lakes have a few bottlenecks that explain odd-looking tracks.
The first is the Soo. Lake Superior sits roughly 21 feet above Lake Huron, and the locks at Sault Ste. Marie are the only way through. The Poe Lock is 1,200 feet long and 110 feet wide, and it is the only chamber that can take the thousand-footers. The U.S. Army Corps of Engineers is building a second lock of the same size beside it. Until that opens, big ships share one doorway, and a tracked freighter that crawls to a stop near Sault Ste. Marie is almost certainly in line.
The second is the Seaway. Its locks limit vessels to about 740 feet in length, 78 feet in beam and 26 feet in draught. That is why the longest lakers stay on the lakes for life, while smaller ships and ocean visitors can pass through.
The third is the Welland Canal, which has eight locks and links Lake Erie with Lake Ontario. Ships stack up there too, and the track shows it. Odd stops and slow stretches also show up in other places, and our piece on why vessel ETAs change explains what moves the numbers.
Reading the track like a regular
A few habits turn a dot into a story. Draught is the first. A laker loaded with ore sits deep, and an empty one rides high, so comparing a ship’s draught on its outbound and return trips shows whether it is carrying cargo. Route history is the second. Use it to see where a ship has been, how long it waited and what path it took. Our guide to analysing route history walks through it. The third is playback of a finished voyage, which is the easiest way to compare a loaded run with the empty trip back. Fleet tracking and route playback shows how.
Let the map come to you
Nobody wants to refresh a map for six hours. Draw a zone around a dock, a lock or a stretch of river and MarineRadar can alert you when a ship enters or leaves it. Add vessel alerts for arrivals and departures on your favourite ships, and use Live Activities if you would rather see updates without opening the app. Zone alerts and Live Activities are both covered in what’s new in MarineRadar in 2026. If you follow several ships, My Fleet keeps them in one list.
What a tracker will not show
A tracker follows ships that broadcast AIS. Commercial vessels of any size do. Many small boats, sailing dinghies and fishing skiffs do not, and some recreational boats only show up if their owners fitted a transponder. The difference between Class A and Class B AIS explains why. AIS also carries no cargo manifest, so you can see that a ship is a freighter but not what is in its holds. If a search comes up empty, our notes on why ships disappear from radar cover the usual reasons.
Add the weather
Lake weather changes fast, and it shapes what ships do. The Weather Map lets you lay wind, rain and cloud over the vessel map. If a freighter slows down or changes course, check the sky before you guess. Weather is context, not proof, but it often explains the move.
Know the season
Great Lakes shipping is seasonal. The Soo Locks typically close from mid-January to late March for maintenance, and ice on the upper lakes backs that up. Most lakers tie up for winter, so a quiet map in February is not a fault. Traffic builds again as the locks reopen in spring and peaks in the warmer months.
What a tracker will not show
Free to start
MarineRadar is free to download on iOS and Android, with optional in-app purchases, and it holds a 4.6 rating from 18,000 reviews. Our free versus subscription comparison explains the difference if you are weighing an upgrade.
FAQs
Can I track Great Lakes ships for free?
Yes. You can download MarineRadar for free on iOS and Android and search a ship by name, IMO or MMSI without paying. Some extras sit behind optional in-app purchases.
How do I find the name of a ship I can see from shore?
Open Ships Near Me from the Tools menu, choose a small radius and tap the nearest entry. You can also switch on vessel labels and set them to Name.
Why has a freighter stopped near Sault Ste. Marie?
It is most likely waiting for the Soo Locks. The Poe Lock is the only chamber big enough for the largest ships, so they take turns. Our Great Lakes guide covers the locks in more depth.
Do small boats show up on a Great Lakes vessel tracker?
Only if they carry a transponder. Commercial ships show up reliably, while many recreational boats do not.
Why is the map so quiet in winter?
The Soo Locks close from about mid-January to late March, and most lakers lay up for the season.
Track the ships behind the story
MarineRadar follows 112,000+ vessels with satellite positions every 5 minutes. Search by name, MMSI or IMO — free on iOS and Android.
