Acronym
AE, aux	Auxiliary engine
ATA	Actual time of arrival
ATD	Actual time of departure
BDF	Bio diesel fuel
BOSP	Beginning of sea passage
BROB	Bunkers remaining on board
BF	Beaufort (Scale)
CF	Current factor
COSP	Commencement of sea passage
ETA	Estimated time of arrival
EOSP	End of sea passage
ETD	Estimated time of departure
ECMWF	European centre for medium-range weather forecasts
GIS	Geographic information system
IMO	International maritime organization
LMT	Local mean time
LNG	Liquid natural gas
LPGB	Liquefied Petroleum Gas (Butane)
LPGP	Liquefied Petroleum Gas (Propane)
MCR	Maximum continuous rating (maximum allowable engine power)
ME	Main engine
MLV	Multi leg voyage
MMSI	Maritime mobile service identity
ROB	Remaining on board
RTA	Required time of arrival
SOG	Speed over ground
SLR	Since last report
VLSFO	Very low sulfur fuel vessel
VPM	Vessel performance model
Waves and Seakeeping
Beam waves	Waves moving towards the side of the hull
Broaching	This is when, at high enough vessel speeds, following and quartering waves have a wavelength that reduces the effectiveness of the rudder.
Bow Waves	Waves that form in front of a vessel
Displacement	The weight of the water a boat displaces when floating
Draft	The vertical distance between the waterline and the bottom of the hull (keel)
Following waves	Waves moving towards the stern (back of the hull)
GM	Metacentric height—a measure of the stability of a vessel, which affects its roll period.
Head waves	Waves moving towards the bow (front of the hull)
High Wave attack	This is when large following and quartering waves happen at a rate that causes the vessel to lose control.
Quartering waves	Waves moving towards the rear of the hull, between beam and following.
Roll period	The roll period is how long it takes for a vessel to tilt back and forth when it is pushed once from the side, kind of like a pendulum.
Parametric Roll	It occurs when the ship's stability changes periodically as it encounters waves, particularly in head, following, or quartering seas. This periodic change in stability can resonate with the ship's natural roll period, causing large and sudden rolling motions.
Peak Wave Period	This is the wave period (in seconds) associated with the most energetic part of the wave spectrum (i.e. from the dominant waves). Peak wave period indicates the period of those waves producing the most energy. ⁠This is the dominant wave system (whether from local wind waves or distant swell).
Sea	Area where wind waves are generated, mixed period and wavelengths
Significant wave height (SWH)	Overall wave conditions. It is defined as the average height of the highest one-third of all waves at a given time⁠. A single wave can be up to twice the significant wave height. The value shown is the maximum wave height forecasted over the 6 hour period.
Sustained wind speed	Mean wind speed experienced continuously by a vessel over a extended period of time
Swell	Waves, often regular in appearance and with longer periods, generated by distant storms.
Swell Period	The approximate time (in seconds) between each swell wave when fixed in space.
Synchronous Roll	This is when the beam wave encounter period (how often waves hit the side of the ship) is close to the natural roll period of the vessel. The roll period is how long it takes for a vessel to tilt back and forth when it is pushed, kind of like a pendulum. It can cause uncontrolled rolling of the vessel and is dangerous.
Wave Direction	The direction from which waves are coming, measured in degrees (relative to true north, where 0° is north, 90° is east, etc.)
Vessel Reports
CP Report	An EOV report that is focused on whether a vessel performed within the terms of a charter-party agreement. Includes the weather, ais data, vessel reports, and math used to support the analysis.
CP Speed	Charter Party Speeds - These are speeds basis which a contract is executed which is usually 1 or 2 depending on how it has been chartered
EOV Report	A report generated by a weather provider (Sofar) that summarizes the activity of a vessel during one or more voyages
Vessel Report	A report from a vessel at a moment in time, summarizing details about that moment and possibly the hours or days prior
Warrant Speed	Warranted Speed - This is one of the speed inside the Charterer party agreement which is guaranteed by Owner to Charterer for performance. However, this might not always be present in all charter parties but some charterers do like to fix vessels with a warranted speed.
Opportunity Cost	Costs (except fuel) associated with operating the ship each additional day. Typically will be equivalent or similar to Daily Hire Rate.