What kind of ship is ROBERT S. PIERSON?

ROBERT S. PIERSON is a cargo ship sailing under the flag of Canada, built in 1974. The vessel is 192 m long with a beam of 21 m and has a gross tonnage of 12,792.

What sanctions and inspection records does Voydar hold for ROBERT S. PIERSON?

Voydar has no matched sanctions record displayed for ROBERT S. PIERSON from the OFAC SDN list, the UK Sanctions List, the Canadian autonomous sanctions list, the EU list of designated vessels, the New Zealand Russia Sanctions Register and the French national asset-freeze register. Coverage may be incomplete; this is not sanctions clearance. No matched inspection records are displayed for ROBERT S. PIERSON. Missing records do not establish whether the ship has been detained.

ROBERT S. PIERSON

Cargo ship · Canada · built 1974 · AIS Class A

IMO7366403MMSI316011905Call signCFN4934Last AIS position Oct 4, 2026, 05:48 UTC

Open in Terminal

In short

ROBERT S. PIERSON (Cargo ship, Canada flag) was last seen on AIS on Oct 4, 2026, 05:48 UTC, under way at 7.7 kn, near Meldrum Bay (Great Lakes). Voydar has no more recent AIS position for this ship. Its current location cannot be established from this report. Its crew-entered AIS destination is MELDRUM BAY, with an ETA of Oct 4, 2026, 06:00 UTC; its reported draught is 4.5 m (voyage report via AISstream.io global terrestrial AIS, received Oct 3, 2026, 13:43 UTC).

Current voyage: from Sault Sainte Marie (departed Sep 28, 2026, 03:08 UTC) to MELDRUM BAY

Vessel type: Cargo ship
Flag: Canada
Year built: 1974
Gross tonnage: 12,792
Size (length × beam): 192 m × 21 m
Registered owner: —

Watch this ship

Get an email when ROBERT S. PIERSON arrives or leaves port, changes destination, name, flag or owner, or is sanctioned, detained or named in an official release.

We email you a link and a code. That creates a free account, no password or card, and follows ROBERT S. PIERSON.

Free account, no card: follow up to 5 ships and ports. Plus follows 50, Pro 500.

By continuing you accept the Terms and the Privacy policy.

Last reported position

received Oct 4, 2026, 05:48 UTC

Position: 45.804° N, 83.2279° W
Area: Great Lakes
StatusWhat do AIS statuses mean?: Under way using engine
Speed: 7.7 kn
Course: 341°
Heading: 341°

45.804° N, 83.2279° W

Open the full live map →

Last 30 days: 4 port calls (Sault Sainte Marie, Sault-Sainte-Marie, and De Tour Village).

Port calls are detected by Voydar from AIS (at least 30 minutes slow inside a harbour area); see Port calls below.

A year of history in the Terminal (Plus) · the full archive since June 1, 2026 (Pro)

Try the live demo, no sign-up

Identity & particulars

Name: ROBERT S. PIERSON
IMO numberWhat is an IMO number?: 7366403
MMSIWhat is an MMSI?: 316011905
Call signWhat is a call sign?: CFN4934
Flag: Canada
Vessel type: Cargo ship
AIS ship type: Cargo
Gross tonnageGross tonnage vs deadweight: Source: Transport Canada — Canadian Register of Large Vessels (open data), record 832253. Added to Voydar on September 23, 2026. Licence: Open Government Licence – Canada 2.0.12,792
Net tonnage: Source: Transport Canada — Canadian Register of Large Vessels (open data), record 832253. Added to Voydar on September 23, 2026. Licence: Open Government Licence – Canada 2.0.4,378
Length overall: 192 m
Beam: 21 m
Year built: 1974

A tag next to a value names the register that supplied it (hover or tap it for the record and date). Values without a tag come from the ship's own AIS broadcasts or from Wikidata. Position and identity are derived live from AIS.

Ownership & management

Each line shows where the fact comes from. Links backed by an identifier point to the company page.

No owner, operator or manager is recorded for this vessel yet.

Timeline

Dated events for this ship from every source Voydar holds, newest first. Each line names its source; derived items say how they were derived.

Date	Event	Source
Sep 28, 2026, 03:08 UTC	Left Sault Sainte MarieAIS-detected	Voydar port-call detector (AIS geofence)
Sep 28, 2026, 02:09 UTC	Arrived at Sault Sainte MarieAIS-detected	Voydar port-call detector (AIS geofence)
Sep 28, 2026, 00:57 UTC	Left Sault-Sainte-MarieAIS-detected	Voydar port-call detector (AIS geofence)
Sep 27, 2026, 17:35 UTC	Arrived at Sault-Sainte-MarieAIS-detected	Voydar port-call detector (AIS geofence)
Sep 27, 2026, 16:58 UTC	Left Sault Sainte MarieAIS-detected	Voydar port-call detector (AIS geofence)
Sep 27, 2026, 15:42 UTC	Arrived at Sault Sainte MarieAIS-detected	Voydar port-call detector (AIS geofence)
Dec 29, 2016	Reported departure from OswegoAuthority-reported	USACE foreign traffic vessel entrances & clearances
Dec 29, 2016	Reported arrival at OswegoAuthority-reported	USACE foreign traffic vessel entrances & clearances
Dec 9, 2016	Reported departure from ClevelandAuthority-reported	USACE foreign traffic vessel entrances & clearances

Owner, operator and manager changes found by comparing yearly EU MRV reports are dated to the reporting year ("during 2025"), not to a day. Port calls here are the most recent only; the full lists are further down.

Port calls

Two kinds of evidence, kept apart: calls Voydar detected from the ship's AIS positions, and arrivals and departures published by port authorities and customs records.

Detected from AIS AIS-detected

Port	Arrived	Departed	Time in port
Sault Sainte Marie USSSM	Sep 28, 2026, 02:09 UTC	Sep 28, 2026, 03:08 UTC	59 min
Sault-Sainte-Marie CASSM	Sep 27, 2026, 17:35 UTC	Sep 28, 2026, 00:57 UTC	7 h 22 min
Sault Sainte Marie USSSM	Sep 27, 2026, 15:42 UTC	Sep 27, 2026, 16:58 UTC	1 h 16 min
De Tour Village USDT4	Sep 26, 2026, 23:09 UTC	Sep 27, 2026, 10:03 UTC	10 h 54 min

Detected by Voydar when the ship's AIS positions stayed slow inside a harbour area. Calls shorter than 30 minutes are not shown. Depends on AIS reception; detection started on June 8, 2026.

Reported by authorities Authority-reported

Port	Record	Date (UTC)	Berth	Source
Oswego USOSW	Departure	Dec 29, 2016(date only)	—	USACE foreign traffic vessel entrances & clearances
Oswego USOSW	Arrival	Dec 29, 2016(date only)	—	USACE foreign traffic vessel entrances & clearances
Cleveland USCLE	Departure	Dec 9, 2016(date only)	—	USACE foreign traffic vessel entrances & clearances
Cleveland USCLE	Arrival	Dec 9, 2016(date only)	—	USACE foreign traffic vessel entrances & clearances
DULUTH-SUPERIOR HARBOR, MN AND WI	Departure	Nov 15, 2016(date only)	—	USACE foreign traffic vessel entrances & clearances
DULUTH-SUPERIOR HARBOR, MN AND WI	Arrival	Nov 15, 2016(date only)	—	USACE foreign traffic vessel entrances & clearances
Detroit USDET	Departure	Nov 12, 2016(date only)	—	USACE foreign traffic vessel entrances & clearances
Detroit USDET	Arrival	Nov 12, 2016(date only)	—	USACE foreign traffic vessel entrances & clearances
Cleveland USCLE	Departure	Oct 23, 2016(date only)	—	USACE foreign traffic vessel entrances & clearances
Cleveland USCLE	Arrival	Oct 23, 2016(date only)	—	USACE foreign traffic vessel entrances & clearances
Oswego USOSW	Departure	Oct 19, 2016(date only)	—	USACE foreign traffic vessel entrances & clearances
Oswego USOSW	Arrival	Oct 19, 2016(date only)	—	USACE foreign traffic vessel entrances & clearances

Records published by the authority named on each row. Earliest record for this ship: June 15, 2004.

Source: US Army Corps of Engineers, Waterborne Commerce Statistics Center (US CBP entrance/clearance records). Licence: US Government work — public domain.

About ROBERT S. PIERSON

MV Robert S. Pierson is a bulk carrier built for and operated on the North American Great Lakes. The vessel went through several owners and several names. In 2007, she was sold to Lower Lakes Towing, a Canadian company. Her last namesake was Robert Scott Pierson, the founder of the shipping firm Soo River Company. An earlier vessel named after Pierson operated from 1980 to 1982. When first commissioned in 1974 she was owned by the Union Commerce Bank, of Cleveland, Ohio. She was operated by Oglebay Norton Corporation and named Wolverine. For the next 32 years, she was operated by various divisions of Oglebay Norton. Oglebay Norton assumed ownership of the vessel in 1994. In 2006, Oglebay Norton sold off its entire fleet to the Wisconsin and Michigan Steamship Company. In 2008, the vessel and two sister ships, David Z. Norton and Earl W.

Summary from Wikipedia, licensed CC BY-SA.

Frequently asked questions

Where is ROBERT S. PIERSON now?: ROBERT S. PIERSON (Cargo ship, Canada flag) was last seen on AIS on Oct 4, 2026, 05:48 UTC, under way at 7.7 kn, near Meldrum Bay (Great Lakes). Voydar has no more recent AIS position for this ship. Its current location cannot be established from this report. The crew-entered destination was MELDRUM BAY (voyage report via AISstream.io global terrestrial AIS, received Oct 3, 2026, 13:43 UTC). This report does not confirm the ship’s current route.
What kind of ship is ROBERT S. PIERSON?: ROBERT S. PIERSON is a cargo ship sailing under the flag of Canada, built in 1974. The vessel is 192 m long with a beam of 21 m and has a gross tonnage of 12,792.
What sanctions and inspection records does Voydar hold for ROBERT S. PIERSON?: Voydar has no matched sanctions record displayed for ROBERT S. PIERSON from the OFAC SDN list, the UK Sanctions List, the Canadian autonomous sanctions list, the EU list of designated vessels, the New Zealand Russia Sanctions Register and the French national asset-freeze register. Coverage may be incomplete; this is not sanctions clearance. No matched inspection records are displayed for ROBERT S. PIERSON. Missing records do not establish whether the ship has been detained.

Use this data

This page is also available as JSON, free, with the source and licence of every section. Sections whose sources do not permit redistribution are listed as withheld.

GET /api/v1/vessels/7366403

View JSON API documentationFree without a key for occasional use; use an API key for more.

Follow by RSS Open data

Using this data in code?

Every account gets a personal API allowance: 2,500 credits a month free, 25,000 with Pro. Pro adds internal business use; API plans add building the data into your own products.

See plans