Definition
A term in maritime insurance law describing the status of a vessel that is stationed in a port rather than underway on a voyage. The phrase is most significant in determining when a marine insurance policy described as "at and from" a named port attaches — that is, when coverage begins to run.
When a vessel is already lying in port at the time a policy is issued, the rule is that coverage under an "at and from" policy does not attach merely because the ship is present in port. Instead, attachment depends on circumstances:
1. Long presence in port before voyage: If the vessel has been lying in port for a substantial period, the policy attaches as soon as preparations for the insured voyage have commenced.
2. Change of ownership in port: If the vessel changes ownership while lying in port, the policy attaches only from the moment the assured becomes the owner — not from the earlier point when the ship first arrived or when preparations began under prior ownership.
Common Confusion
"Lying in port" should not be confused with the simple fact of a ship being docked or anchored. The legal significance of the phrase is specific to the attachment question in "at and from" policies. A vessel may be physically present in a port without any legal consequence under this doctrine; the doctrine operates only when a policy uses "at and from" language and a question arises about when the insurer's risk actually begins.
Why It Matters in Research
Researchers working with historical marine insurance materials will encounter this term primarily in the context of policy attachment disputes. The doctrine is narrow but practically important: it resolves the ambiguity inherent in "at and from" policies when a ship has not just arrived but has been sitting idle in port for some time before sailing.
The critical trap in historical sources is that attachment rules for marine insurance were not uniform across jurisdictions and evolved through case law over the nineteenth century. American courts worked through these questions with some variation, and Bouvier's entry reflects the state of American admiralty and commercial practice as synthesized from early federal and New York decisions. Researchers should not assume that the attachment rule Bouvier states was settled doctrine everywhere or that it remained static.
For corpus researchers: this term will appear almost exclusively in marine insurance cases, insurance treatises, and shipping contract disputes. It will rarely if ever appear in criminal, property, or general commercial law contexts. When searching historical case law, pairing "lying in port" with "at and from" and "attachment" will sharply focus results.
Note also that the ownership-change rule embedded in this doctrine anticipates insurable interest analysis — a researcher following this thread should move to insurable interest doctrine for the underlying principle that a policy cannot attach to protect a party who has no ownership stake in the vessel.
Historical Dictionary Support
Bouvier's Law Dictionary provides the only substantive historical dictionary treatment available in the Law Mind corpus. Bouvier's formulation is compact but precise, drawing on early American maritime decisions to establish two distinct attachment rules depending on how long the vessel has been in port and whether ownership has changed. The cases Bouvier cites — from the federal circuit courts and the New York courts of the early nineteenth century — reflect the period when American marine insurance law was being actively constructed from English precedent and domestic commercial practice.
What Bouvier does not address: the definition says nothing about what constitutes "a long time" lying in port, leaving that determination to judicial discretion. Nor does it address policies that are not framed as "at and from" policies. Researchers should treat Bouvier's formulation as a summary of case-law outcomes rather than a codified rule with bright-line thresholds.
Jurisdictional Note
The doctrine as stated by Bouvier reflects early American federal and New York practice. English marine insurance law governed by the Marine Insurance Act 1906 addresses "at and from" policies with related but not identical rules. Researchers working with English sources should not assume identity with the American formulation Bouvier describes.