Ullage
Definition, usage, and regulatory context for this maritime term.
Definition
A specialised maritime term used in navigation, seamanship, and international shipping conventions. The term has precise legal and technical meaning under IMO instruments, charter party clauses, and industry standard practice.
Usage Context
Navigation: Used in passage planning, bridge watchkeeping, and VTS communications to convey precise positional or operational information.
Commercial: Appears in charter parties, bills of lading, and cargo documentation. Misinterpretation can lead to demurrage disputes or cargo claims.
Regulatory: Defined in IMO conventions, Codes (IMDG, ISM, ISPS), and flag state national legislation. Precise compliance requires reference to the applicable instrument.
Communication: Standardised by SMCP (Standard Marine Communication Phrases) for use in VHF communications to reduce ambiguity between different language speakers.
Term Details
Regulatory References
SOLAS V
Safety of Navigation — bridge procedures and watchkeeping
STCW Code
Officer competency standards including terminology
IMO SMCP
Standardised marine communication phrases