> ## 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.

# Fleet overview

> The home page — a single screen for fleet-wide CII, EU ETS, and FuelEU status.

The fleet overview is the landing page. It answers the four questions a fleet manager has every Monday morning: how many vessels reported, what's our CO₂, what's our ETS bill so far, and are we FuelEU-compliant?

<Frame caption="Fleet overview — year selector, four KPI cards, CII distribution, voyage breakdown, and the vessels table.">
  <img src="https://mintcdn.com/metaweaveconsultant/ZChQsW2FZuO2wFx2/images/fleet-overview/full-page.png?fit=max&auto=format&n=ZChQsW2FZuO2wFx2&q=85&s=62d02a67f609913611241a1708afd7a9" alt="Fleet overview full page" width="2880" height="2592" data-path="images/fleet-overview/full-page.png" />
</Frame>

## What's on the page

### Year selector

A single dropdown drives everything. Pick any year that has data. For the current year, a **YTD** toggle restricts the data to year-to-date.

<Frame caption="Year selector with optional YTD checkbox for the current year.">
  <img src="https://mintcdn.com/metaweaveconsultant/ZChQsW2FZuO2wFx2/images/fleet-overview/year-selector.png?fit=max&auto=format&n=ZChQsW2FZuO2wFx2&q=85&s=7d51917338f4dc76b42774670be628f4" alt="Year selector" width="2880" height="2592" data-path="images/fleet-overview/year-selector.png" />
</Frame>

### Summary cards

Four KPI cards across the top:

* **Active Vessels** — count of vessels with data, plus the total fleet size
* **Total CO₂ Emissions** — fleet-wide tonnes, plus distance sailed
* **EU ETS Total Cost** — projected cost in EUR, plus in-scope emissions
* **FuelEU Compliance Status** — Compliant / Non-Compliant, plus fleet GHI vs. target

### CII A–E distribution

A donut chart breaks the fleet down by rating band, with the fleet-average CII annotated in the centre. Hover any band to see the count of vessels in that band.

<Frame caption="CII distribution chart — fleet-wide A–E breakdown.">
  <img src="https://mintcdn.com/metaweaveconsultant/ZChQsW2FZuO2wFx2/images/fleet-overview/cii-distribution.png?fit=max&auto=format&n=ZChQsW2FZuO2wFx2&q=85&s=a131c244e37d34c489bdd08b6a96c168" alt="CII distribution donut" width="2880" height="2592" data-path="images/fleet-overview/cii-distribution.png" />
</Frame>

### EU ETS voyages breakdown

Counts of voyages by classification — Intra-EU, Into-EU, Out-of-EU, Non-EU — alongside the year's phase-in factor (40% in 2024, 70% in 2025, 100% from 2026).

### Fleet vessels table

A sortable, paginated table with one row per vessel:

* Vessel name + IMO
* CII attained / required / rating
* EU ETS cost
* FuelEU intensity + status

Click any row to drill into the [vessel detail page](/product/vessel-detail).

## What you can do here

* Compare fleet performance year-over-year by switching the year selector
* Spot underperforming vessels at a glance from the rating distribution
* Click into a vessel for a deep dive
* Project EU ETS cost with the configurable EUA price (set via `DEFAULT_EUA_PRICE`)

## Source

Powered by `/api/fleet/combined` and `/api/fleet/years`. The underlying business logic lives in `FleetService` (`src/lib/services/FleetService.ts`).