COLREG
Colreg
Maritime abbreviation — full form, usage, and source reference.
Abbreviation
COLREG
Category
Maritime / Navigation
Source
IMO / IHO / Industry
Usage
International
Full Form & Meaning
Full Form
Colreg
This abbreviation is widely used in maritime operations, navigation documents, and international shipping communications. Its exact interpretation may depend on context — e.g., an abbreviation used in MARPOL documentation may differ slightly from the same abbreviation in a charter party.
Usage Context
Navigation documents: Used on charts, sailing directions, Light Lists (NP), and tide tables.
Regulatory instruments: Appears in SOLAS, MARPOL, STCW conventions and IMO codes.
Commercial shipping: Commonly found in charter parties (C/P), bills of lading (B/L), and port documents.
VHF communications: Some abbreviations are standardised by IMO SMCP for bridge-to-bridge and ship-to-shore communications.
Common Abbreviations — Quick Reference
| Abbreviation | Full Form |
|---|---|
| ETA | Estimated Time of Arrival |
| ETD | Estimated Time of Departure |
| SOG | Speed Over Ground |
| COG | Course Over Ground |
| ECDIS | Electronic Chart Display and Information System |
| GMDSS | Global Maritime Distress and Safety System |
| ISM | International Safety Management Code |
| ISPS | International Ship and Port Facility Security Code |
Source References
IMO Conventions
SOLAS, MARPOL, STCW, COLREG
IHO Publications
S-4, S-57, S-100 series
Admiralty NP series
Sailing Directions, List of Lights