> ## Documentation Index
> Fetch the complete documentation index at: https://docs.appliedaifoundation.org/llms.txt
> Use this file to discover all available pages before exploring further.

# Vessel detail

> Deep dive into a single vessel's annual performance — CII, EEOI, fuel mix, voyages, and legs.

The vessel page is where compliance teams spend most of their time. It shows everything one vessel did in one year, across all five regulations.

<Frame caption="Vessel detail header — name, IMO, type, fleet, year selector.">
  <img src="https://mintcdn.com/metaweaveconsultant/ZChQsW2FZuO2wFx2/images/vessel-detail/header.png?fit=max&auto=format&n=ZChQsW2FZuO2wFx2&q=85&s=3f4e146d9a3ddeb0729c42ae95b09367" alt="Vessel detail header" width="2880" height="4520" data-path="images/vessel-detail/header.png" />
</Frame>

## What's on the page

### Summary cards

Four cards across the top: Voyages (count + total distance), Sea Days (+ port days), Total CO₂, Total Fuel. Each card is one number plus a sub-figure for context.

### CII performance

<Frame caption="CII gauge with rating bands and a side-by-side comparison of database vs. reefer-corrected CII.">
  <img src="https://mintcdn.com/metaweaveconsultant/ZChQsW2FZuO2wFx2/images/vessel-detail/cii-gauge.png?fit=max&auto=format&n=ZChQsW2FZuO2wFx2&q=85&s=73a4ebc599d9df7d8bb306462cc00c91" alt="CII gauge and comparison box" width="2880" height="4520" data-path="images/vessel-detail/cii-gauge.png" />
</Frame>

A radial gauge plots Attained CII against the required line, with A/B/C/D/E zones drawn in the background. Next to it, a comparison box shows two CII values:

* **Database CII** — what's reported in the consumption logs
* **Corrected CII** — with reefer container CO₂ stripped out per [MEPC.355(78)](/methodology/reefer-correction)

A link opens the MEPC.355(78) PDF in an in-app slide-out panel for reference.

### EEOI

<Frame caption="EEOI by TEU and by weight, with supporting transport-work metrics.">
  <img src="https://mintcdn.com/metaweaveconsultant/ZChQsW2FZuO2wFx2/images/vessel-detail/eeoi.png?fit=max&auto=format&n=ZChQsW2FZuO2wFx2&q=85&s=389f8c4a831e4c1fa4c70a0e13db31d4" alt="EEOI panels" width="2880" height="4520" data-path="images/vessel-detail/eeoi.png" />
</Frame>

Two EEOI numbers, calculated automatically based on ship type:

* **EEOI by TEU** — gCO₂ / TEU-NM (for container ships)
* **EEOI by Weight** — gCO₂ / tonne-NM (for bulkers and general cargo)

Plus the underlying transport work, total CO₂, total distance, and average cargo per voyage.

### Fuel breakdown

<Frame caption="Fuel consumed in the year, hierarchical by fuel category.">
  <img src="https://mintcdn.com/metaweaveconsultant/ZChQsW2FZuO2wFx2/images/vessel-detail/fuel-breakdown.png?fit=max&auto=format&n=ZChQsW2FZuO2wFx2&q=85&s=c8928a81d82114b849bb4c10627bed94" alt="Fuel breakdown panel" width="2880" height="4520" data-path="images/vessel-detail/fuel-breakdown.png" />
</Frame>

Tonnes by fuel type, displayed hierarchically:

* HFO (Total) = VLSFO + HFO LLS
* MDO / MGO
* LNG, Methanol, Biofuel blends, etc.

### CII rolling chart

<Frame caption="12-month rolling CII chart with required-CII step lines per year and brush-to-zoom.">
  <img src="https://mintcdn.com/metaweaveconsultant/ZChQsW2FZuO2wFx2/images/vessel-detail/rolling-chart.png?fit=max&auto=format&n=ZChQsW2FZuO2wFx2&q=85&s=cee1b2c7a4e859fd1dda336c1bb58afc" alt="CII rolling chart" width="2880" height="4520" data-path="images/vessel-detail/rolling-chart.png" />
</Frame>

Daily Attained CII plotted over a multi-year window (2023 → current+1 year by default), with the year's Required CII as a stepped baseline. Rating bands are drawn as background colours. A brush at the bottom lets you zoom into any date range.

### Voyages table — expandable

<Frame caption="Voyages list, expandable row showing leg-by-leg ETS coverage.">
  <img src="https://mintcdn.com/metaweaveconsultant/ZChQsW2FZuO2wFx2/images/vessel-detail/voyages-expanded.png?fit=max&auto=format&n=ZChQsW2FZuO2wFx2&q=85&s=aea69c55f3b475e818ca32c13d2105ab" alt="Expandable voyages with legs" width="2880" height="4876" data-path="images/vessel-detail/voyages-expanded.png" />
</Frame>

One row per voyage with route, dates, total CO₂, distance, average CII, ETS classification, and ETS cost. Click any row to expand into a sub-table of legs:

* Leg # and route (port → port)
* Sea CO₂, sea-covered (with coverage %), EU port CO₂, total covered
* ETS coverage factor applied per leg

This is the most detailed view of how the EU ETS bill is built up for each vessel.

## What you can do here

* See exactly which voyage and which leg generated each tonne of covered CO₂
* Compare attained CII trends against the required threshold over time
* Verify that reefer correction has been applied correctly
* Pick a year and see the year-end picture, or use YTD for live monitoring
* Use the breadcrumb to jump back to the fleet view

## Source

Powered by `/api/vessels/[imo]`, `/api/vessels/[imo]/cii-daily`, and `/api/vessels/[imo]/voyages`. Business logic in `VoyageSegmentService` and `FleetService`.