Maritime Terms, Abbreviations and Acronyms

Maritime abbreviations and acronyms go back to those days we used telegram and telex to communicate. The business model for telex and telegrams was “pay per letter”. Even though the telegrams and telexes have been retired, we still use the maritime abbreviations daily.

Below you will find a comprehensive list of terms, abbreviations, and acronyms used in the maritime industry, sorted in alphabetical order. You can search for an acronym or write a word and find the abbreviations where the word is included.

If you think some abbreviations are missing, send us an e-mail at post@maritimeoptima.com or open the chat icon on the bottom of this page.

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RIT

Refining in transit

RM

Engine room platform (OCIMF acronym)

RMO

Regional Marine Operations

RMRGC

Recommendations for Manifolds of Refrigerated for Gas Carriers for Cargoes

RNR

Rate not reported

RO

Registered office

RO

Registered office

RO-RO

Roll-On/Roll-Off

Ro-Ro Cargo Ship

A single or multi deck cargo ship for the carriage of laden vehicles which are loaded via ramps

Ro-Ro Cargo Ship, Inland Waterways

A vessel designed for the transportation of Ro-Ro Cargo. Not designed for operation in open sea

Ro/Ro

A shortening of the term, “Roll On/Roll Off.” A method of ocean cargo service using a vessel with ramps which allows wheeled vehicles to be loaded and discharged without cranes. Also refers to any specialized vessel designed to carry Ro/Ro cargo.

Roads

Anchorage Area

ROB

Remaining on board. The volume of cargo, usually expressed in barrels or cubic meters, left on board a tankship at a particular point of a voyage. Final ROB volumes after the completion of discharge, if too high (& deemed pumpable IAW C/P terms), can result in cargo claims from the charterer to the shipowner.

ROC

Reference Our Cable....(date)

Rocket Launch Support Ship

A vessel equipped to transport rocket sections to isolated launch sites

ROCKPHOS

Phosphate Rock

ROI

Return on Investment

Roll

To re–book cargo to a later vessel.

Roll-on/Roll-off vessels

Ships specially designed to carry wheeled containers or trailers using interior ramps. Includes all forms of car and truck carriers.

Roll–on/Roll–off vessels

Ships specially designed to carry wheeled containers or trail- ers using interior ramps.

Rolling

Ship Stability: is when the vessel rotates about the longitudinal (front/back) axis

Rolling

The side–to–side (athwartship) motion of a vessel.

RON (Research Octane Number)

A rating of the anti-knock properties of a finished motor gasoline or blendstock. The test to determine RON stimulates mild engine operating conditions such as motoring at moderate speeds. The RON method yields higher numbers than the MON (motor octane number) test which reflects heavy loads and high speeds.

RORO

Roll On/Roll Off

RoRo Barge

The Roll On/Roll Off, or RO/RO barge is a deck barge with multiple decks that can accommodate enormous numbers of containers, trailers, or rail cars, allowing them to be wheeled directly onto or off the barge.