How Shotline Verifies Wreck Information

Research methodology and source standards

Shotline Diving is built around one principle: shipwreck information should be traceable, cross-checked, and clearly labeled according to confidence.

Not every wreck record is equally complete. Not every coordinate is equally accurate. Not every historical account agrees. This page explains how Shotline researches, classifies, verifies, and updates wreck records across the Great Lakes and St. Lawrence system.

Core Philosophy

Shotline does not treat a single source as absolute authority. Wreck records are built through archival research, government records, newspaper reports, diver observations, sonar interpretation, chart analysis, historical cross-referencing, and community submissions.

When sources conflict, major interpretations may be preserved, uncertainty is documented, and speculative claims are labeled accordingly. The goal is evidence over legend.

Verification Status System

Every wreck or site is assigned a working research status.

Status	Meaning
VERIFIED	Physically confirmed through diving, sonar, ROV, or documented survey.
CONFIRMED HISTORICAL LOSS	Historical sinking verified, exact wreck condition or location may vary.
PROBABLE	Strong evidence exists, but incomplete confirmation.
REPORTED	Mentioned in historical records but lacking sufficient corroboration.
POSSIBLE TARGET	Sonar or chart anomaly, or repeated local reports requiring investigation.
DESTROYED	Wreck known destroyed, salvaged, dredged, dispersed, or lost to shoreline development.
MISIDENTIFIED	Historical attribution later determined incorrect.
UNDER ACTIVE RESEARCH	Record currently being reviewed or expanded.

How Wrecks Are Verified

Shotline records are built through layered evidence. No single source automatically confirms a wreck.

• diver reports
• side-scan sonar
• multibeam sonar
• ROV footage
• underwater photography
• historical charts
• shipping registers
• casualty reports
• newspaper accounts
• insurance records
• harbor master records
• archival correspondence
• construction records
• personal accounts
• survey logs

Primary Research Sources

Maritime History of the Great Lakes

Maritime History of the Great Lakes is one of the most important Great Lakes maritime research resources available online. Shotline uses it extensively for vessel histories, casualty reports, newspaper transcriptions, ship lists, ownership records, and regional maritime history.

Library and Archives Canada

Library and Archives Canada is used for federal records, marine reports, navigation records, historical photographs, ship registries, maps, and transportation records.

Library of Congress

Library of Congress Digital Collections are used for newspapers, historical maps, engineering drawings, photographs, shipping reports, and regional documentation.

Provincial and State Archives

Research frequently includes the Archives of Ontario, Michigan state archives, Wisconsin historical collections, New York archives, Ohio archives, Minnesota archives, and Pennsylvania historical records.

Newspapers and Historical Reporting

Historical newspapers are often essential for sinking timelines, survivor accounts, weather conditions, cargo information, ownership disputes, salvage attempts, and navigation hazards.

• Toronto Globe / Globe and Mail
• Kingston Whig-Standard
• Detroit Free Press
• Chicago Tribune
• Cleveland Plain Dealer
• Duluth News Tribune
• Milwaukee Sentinel
• Toledo Blade

Whenever possible, multiple newspaper versions are compared, publication dates are verified, and transcription errors are checked.

Diver Reports and Field Verification

Diver observations remain critical. However, diver recollections can conflict, site conditions change, visibility affects interpretation, and repeated visits may produce different conclusions.

Diver reports are treated as field evidence, not automatic proof. Strong reports may include measurements, compass headings, identifiable machinery, hull construction details, photographic evidence, and repeat observations.

Sonar and Remote Survey Methods

Shotline uses side-scan sonar, multibeam sonar, bathymetric overlays, GIS coordinate analysis, chart comparisons, and remote sensing interpretation.

Modern sonar increasingly reveals previously unknown wrecks, debris fields, split wreck structures, shoreline changes, buried targets, anchorages, and historical channel modifications. Sonar targets alone are not automatically labeled as confirmed wrecks. Targets may remain probable, possible, or under investigation until additional evidence exists.

Nautical Charts and Hydrographic Data

Coordinate Confidence and GPS Standards

Every coordinate on Shotline carries a confidence rating that reflects the quality of the underlying evidence.

Confidence Level	Meaning
Exact	GPS fix taken directly over the wreck by a diver, ROV, or sonar survey. Accurate to within ~10 metres.
Approximate	Coordinate derived from charted position, NOAA AWOIS data, or cross-referenced reports. May vary 50–500 m.
General Area	Derived from historical accounts, lighthouse logs, or regional newspaper reports. Accuracy is 0.5–5 km.
Unknown	No coordinate data on file.

Historical and modern charts are compared to identify hazards, locate former navigation routes, track channel dredging, compare shoreline changes, identify obstructions, and locate charted wrecks.

Sources may include NOAA charts, Canadian Hydrographic Service charts, Army Corps surveys, historical admiralty charts, and harbor engineering plans.

Ship Registers and Vessel Databases

Shotline cross-checks vessel dimensions, ownership, tonnage, builders, rebuilds, renamings, and registration numbers.

Frequently referenced resources include Lloyd’s Register, Great Lakes Vessels Database at Bowling Green State University, the Swayze Shipwreck File, Marine Museum of the Great Lakes, and Naval Marine Archive.

Personal Accounts and Oral Histories

Eyewitness reports can contain valuable details unavailable elsewhere. These may include family records, local stories, fishermen accounts, diver recollections, salvager notes, and harbor worker testimony.

Memory can shift over time, names and locations may vary, and legends often merge multiple wrecks. Oral history is preserved carefully and labeled appropriately.

Photographs, Video, and Sketches

Visual documentation may include underwater photography, ROV footage, side-scan imagery, wreck sketches, historical launch photos, salvage photographs, newspaper engravings, and drydock records. Whenever possible, image source is credited, dates are preserved, and original context is retained.

Mapping and Coordinates

Coordinates on Shotline may represent an exact wreck position, debris field center, approximate historical location, charted hazard position, or generalized research area. Not all coordinates have equal precision.

Coordinates may be intentionally generalized when site protection is necessary, cultural preservation concerns exist, looting risk exists, or sensitive archaeological concerns apply.

Ethical Standards

Shotline supports preservation-first diving, documentation over artifact recovery, responsible wreck access, and historical conservation.

Shotline does not support unauthorized salvage, site vandalism, artifact trafficking, or destruction of archaeological context. Protected sites must be respected according to local laws, provincial regulations, federal legislation, and marine sanctuary rules.

Structured Database

Shotline maintains a structured research database backing every wreck page on this site. Each record tracks identification confidence, coordinate confidence, research status, source count, verified claims, wreck events, and linked persons (captains, owners). This structured layer allows consistent filtering, cross-referencing, and future data exports for research and preservation purposes.

Research statuses in the database correspond to the verification levels described above. Where multiple conflicting values exist for a field, the highest-confidence version is displayed, with alternatives preserved in the underlying record.

Research Is Ongoing

Great Lakes shipwreck research constantly evolves. New sonar surveys, diver reports, archive discoveries, chart releases, digitized newspapers, and government collections continue to change what is known.

Many Shotline records remain incomplete, under revision, and open to correction. Corrections and evidence-based contributions are welcomed.

Contribution Standards

Evidence-based corrections and additions are welcomed. Acceptable submissions include: primary source citations (newspapers, government records, vessel registries), sonar imagery with metadata, dive reports with GPS coordinates and photographs, and documentary evidence such as enrollment records or bills of sale. Unverified local legend, second-hand accounts without attribution, or claims that contradict established primary sources require additional corroboration before they are incorporated.

Submissions can be made through the Contribute page. All contributors are acknowledged.

Major External Research Resources

• Maritime History of the Great Lakes
• Library and Archives Canada
• Library of Congress Digital Collections
• Great Lakes Vessels Database at BGSU
• Thunder Bay National Marine Sanctuary
• Great Lakes Shipwreck Museum
• Naval Marine Archive
• Archives of Ontario
• Toronto Public Library Digital Archive
• Google News Archive

Final Note

Shipwreck research is rarely final. Records evolve as new evidence appears, locations are refined, identities are corrected, archives are digitized, divers revisit sites, and technology improves.

Shotline Diving treats every wreck record as part of an ongoing historical investigation, not a finished story.