Local browser workbook for vessel fuel records, MRV scope checks, CO2 totals, transport work, and EEOI.
| Vessel | Year | Voyage | Op. | Type | MRV scope | Departure | Arrival | Distance | Cargo | Fuel | CO2 | EEOI | Fuel types | Actions |
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Save records to generate a report.
The MRV CO2 Recorder is a browser-based workbook for ship managers, technical departments, and marine operators who need a practical way to record voyage operations, port stays, anchorage periods, manoeuvring, canal transits, fuel consumption, CO2 emissions, transport work, and EEOI values. It is designed for internal technical checks and day-to-day recordkeeping before data is transferred into a verified compliance workflow.
Monitoring, reporting, and verification systems generally rely on accurate activity records and fuel consumption evidence. In shipping, CO2 is commonly calculated from fuel consumed multiplied by an emission factor. This local recorder keeps each operation as a separate line so sea passages and port activities remain clear, traceable, and easy to review.
For each fuel row, CO2 emitted equals fuel consumed in tonnes multiplied by the selected emission factor in tonnes of CO2 per tonne of fuel. Transport work is calculated as cargo carried multiplied by distance travelled. EEOI expresses operational carbon intensity as grams of CO2 per tonne nautical mile, using total CO2 in tonnes converted to grams and divided by transport work.
A voyage may include sea passage, port stay, anchorage, manoeuvring, canal transit, and other operational periods. Keeping these activities separate helps teams check fuel allocation, MRV scope, port activity emissions, voyage totals, and internal performance indicators without losing the detail needed for audit review.
This tool is a calculator and local browser recorder. It is not a database, approval workflow, class-approved MRV platform, or replacement for a verified monitoring plan. Results should be treated as preliminary calculations, internal recordkeeping, and technical cross-checks. Always verify final values against bunker delivery notes, measurement records, company procedures, the approved monitoring plan, and applicable EU MRV, UK MRV, UK ETS, EU ETS, or other rules.
Records are saved locally in browser storage on the device being used. Nautical Solver does not upload or access the records. The Excel import and export template is intended to let users edit records in a familiar spreadsheet format and re-import them later. The JSON backup function stores all vessels, records, custom fuel factors, custom ports, and settings so data can be protected or moved between devices.
The port helper is designed as an assistant, not a gatekeeper. Users can type any port manually, save custom ports, or use suggestions from the bundled port libraries. A larger World Port Index style dataset can be loaded by the page to improve search coverage, while company-specific UN/LOCODE validation can still be handled outside this local workbook when required.
A practical internal workflow is to create the vessel, record every sea passage and port activity as it occurs, check fuel and CO2 totals, review MRV scope classifications, export the Excel template for team review, then create a backup before clearing browser data or changing devices. The report view gives a compact technical summary, while the exported workbook remains the better format for detailed checking and correction.