Appendix - ID Overview

A range of IDs are included in Navigate. These are referred to in the node descriptions above. Below, all of them are explained and all possible IDs are listed.

EnergyDemandTypeID

This ID describes the type of energy demand that is targeted by a certain technology.

ID	Description
PROPULSION	The technology targets the energy demand for propelling the vessel forward. Example: Kite, Flettner rotor.
ELECTRICAL	The technology targets the vessel’s electricity demand. Example: Waste heat recovery system, lighting system.
HEAT	The technology targets the vessel’s heat demand. Example: Exhaust gas boiler.

ExtrapolateID

The Extrapolate ID describes the method used for extrapolating in Curves and Forecasts.

ID	Description
FALSE	Do not allow extrapolation. Error is thrown if attempting.
FLAT	Extrapolate flat from the closest value in the table.
LINEAR	Linear extrapolation from the last two values in the table.

FileFormatID

The FileFormat ID describes the file format used when exporting report data.

ID	Description
XLSX	Export the report as a single Excel workbook with one sheet per report table.
CSV	Export the report as CSV files with one file per report table.

FuelTypeID

The fuel type describes the type of molecule that a fuel is based on. I.e., ‘fuel type’ is not synonymous with ‘fuel’.

Different fuels can have the same fuel type, as a fuel corresponds to a fuel-pathway (where the pathway describes how it was produced).

ID	Description
AMMONIA	The fuel primarily consists of the molecule ammonia. Fuel examples: Blue ammonia, e-ammonia, grey ammonia.
ELECTRICITY	Not actually a fuel, but a way to implement battery-electric vessels.
ETHANOL	The fuel primarily consists of the molecule ethanol. Fuel example: Bio-ethanol.
HYDROGEN	The fuel primarily consists of the molecule hydrogen. Fuel examples: Blue hydrogen, e-hydrogen, grey hydrogen.
LPG	The fuel is a pressurized liquefied gas. Fuel examples: Butane and propane.
METHANE	The fuel primarily consists of the molecule methane. Fuel examples: LNG, bio-methane.
METHANOL	The fuel primarily consists of the molecule methanol. Fuel examples: Bio-methanol, e-methanol.
OIL	The fuel is an oil or diesel based fuel. Fuel examples: HFO, LFO, VLSFO, MDO, MGO, bio-diesel, bio-oil, or e-diesel.

Interpolate1DID

The Interpolate1D ID describes the method used for interpolating in Curves and Forecasts.

ID	Description
LINEAR	Perform linear interpolation between points in the table.
PREVIOUS	Pick the previous value when interpolating.
NEXT	Pick the next value when interpolating
NEAREST	Pick the closest value when interpolating (rounding down at 0.5)
NEAREST_UP	Pick the closest value when interpolating (round up at 0.5)

Interpolate2DID

The Interpolate2D ID describes the method used for interpolating in Surfaces and Timetables.

ID	Description
LINEAR	Perform linear interpolation between points in the table.
NEAREST	Pick the closest value when interpolating (rounding down at 0.5)

LevySchemeID

These IDs describe the way that a levy will regulate emissions.

ID	Description
PENALTY	The levy penalizes emissions
SUBSIDY	The levy subsidizes avoiding emissions and reaching below a set threshold
BOTH	The levy penalizes emissions above a set threshold and subsidizes avoiding emissions and reaching below the set threshold

PolicyScopeID

These IDs describe what emissions are included under the scope of the policy, in reference to what processes the emissions are due to.

ID	Description
WTT	Short for: Well-to-tank The emissions targeted under the policy are the ones associated with extracting resources and processing them into a bunker fuel.
TTW	Short for: Tank-to-wake The emissions targeted under the policy are the ones associated with consuming the bunker fuel on a vessel.
WTW	Short for: Well-to-wake The emissions targeted under the policy are the ones associated with extracting resources and processing them into a bunker fuel, as well as the ones associated with consuming the bunker fuel on a vessel.

RegulationMeasureID

These IDs describe the way that a regulation will measure emissions in terms of the scope of the measure.

ID	Description
ABSOLUTE	Absolute emissions measured in mass of emissions (ton of emissions)
INTENSITY	Emissions intensity meaning emissions per energy consumed (ton of emissions per gigajoule, ton/GJ)
TRANSPORT_NOMINAL	Emissions intensity per NOMINAL transport work (ton of emission per nominal cargo-mile)
TRANSPORT	Emissions intensity per ACTUAL transport work (ton of emission per actual cargo-mile)

RegulationSchemeID

These IDs describe the way that a regulation will regulate emissions.

ID	Description
INDIVIDUAL	Every vessel must be compliant with the regulation and trading emission certificates from overcompliance is not possible.
FLEXIBLE	Vessels may trade emission certificates between them by certain vessels being overcompliant with the regulation.

ReportReduceID

ReportReduceID is used for reducing tuples in the reports for easier data manipulation.

ID	Description
NONE	This means no reduction of the tuple(s)
FIRST	This means reduction over the first element of the tuple(s)
SECOND	This means reduction over the second element of the tuple(s)
BOTH	This means reduction over both elements of the tuple(s)

RouteTypeID

These IDs describe the principle of how the vessel moves between ports.

ID	Description
ROUND_TRIP	The defined start port is automatically considered the end port. The order in which the ports are entered determines the order in which the vessel visits them. Individual legs of the journey are specified, allowing inputs for different distance, speeds and capacity utilization etc. on separate legs. The same port can be visited more than once.
REGIONAL_TRIP	There is no defined start or end port. Individual legs of the journey are not specified. Instead, a distribution of fraction of time spent at different speeds and cargo capacity can be defined. The same port can be visited more than once.

SolverBackendID

These IDs select the solver backend used to solve the bunker algorithm’s linear program. HiGHS is installed with Navigate and always available; Gurobi requires the optional extra (pip install .[gurobi]) and a full Gurobi license.

ID	Description
AUTOMATIC	Tries Gurobi first. If Gurobi is not installed or licensed, falls back to HiGHS.
GUROBI	Prefers Gurobi. If Gurobi is not available, falls back to HiGHS.
HIGHS	Skips Gurobi entirely and uses HiGHS directly.

SolverMethodID

These IDs select the LP solution method used by the solver backend. The values mirror Gurobi’s Method parameter; the HiGHS backend uses its hybrid interior-point method regardless of this setting.

ID	Description
AUTOMATIC	Let the solver choose the algorithm automatically.
DETERMINISTIC	Deterministic concurrent solve; results are reproducible from run to run.
NON_DETERMINISTIC	Non-deterministic concurrent solve; may be faster but can vary from run to run.

SpeedAlignmentID

This ID describes how the individually optimized speeds are aligned across vessel types in a fleet during speed management.

ID	Description
INDIVIDUAL	Each vessel type keeps its own optimal speed.
MINIMUM	All vessel types use the minimum optimal speed across the fleet.
MAXIMUM	All vessel types use the maximum optimal speed across the fleet.
AVERAGE	All vessel types use the weighted arithmetic mean of the optimal speeds.

SourceDependencyID

These IDs describe the type of dependency the electricity source has to the region

ID	Description
STANDALONE	The electricity source for the production of fuels are standalone and not connected to the electricity grid in the region.
CONNECTED	The fuel production is connected to the region’s electricity grid. And the average emissions associated with electricity consumption in the defined region.