Explain the following:

• SEEMP Part I - Ship Energy Efficiency Management Plan, the general framework/policy of the ship's energy efficiency monitoring and operational measures (fuel, consumption, improvement measures such as speed optimisation, hull/propeller cleaning, trim, machinery, waste heat); all ships carry it.
• SEEMP Part II - the ship's specific energy-efficiency component that links to the carbon-intensity regime: it defines the ship-specific required CII (annual) and the measures to meet the yearly improving target; it aligns the attained CII with the required carbon intensity.
• SEEMP Part III - the operational implementation component: the plan that sets the required and attained CII, the improvement trajectory, the data collection and reporting, and the corrective/improvement actions; it must be updated annually with the attained CII and is verified/reported to the IMO under the 2023 CII regime.

• EEXI (Energy Efficiency Existing Ship Index): a technical efficiency index (gCO2/(tonne-mile) per ship type/size) for existing ships (in units of g CO2 per capacity-mile) which establishes a "required" EEXI (a baseline phased targets) that existing ships must meet from 1 January 2023; a ship whose attained EEXI exceeds the required value must install energy-saving technology (e.g. propulsion power limitation, engine power limitation, WSR) to comply; it is a technical "engineered" assessment of the ship's energy efficiency (attained vs required).
• CII (Carbon Intensity Indicator): an operational measure (annual) of the ship's carbon intensity = gCO2/(capacity x distance) (grammes CO2 per dwt-nautical mile or per gross ton-m at loading), calculated each year from the fuel/oil data; the ship is given a rating A to E (A best) compared with the required CII (a reference/improvement curve); the SEEMP Part III and "corrective action plan" are required if the rating is poor (E or D for 3 years); verifies actual operational efficiency. Both are part of MARPOL Annex VI amending the energy-efficiency regime (with the EEXI from 1 Jan 2023 and CII calculation/reporting annually).