Step 01
On the device
A trip is recorded and classified into walk, cycle, bus, rail and car, before anything is sent.
Travel emissions weren't made to be estimated. Ozomark was made to measure them.
Unrecorded journeys don't vanish. They bleed into your CRP liability. Ozomark captures every commute, trip and fleet mile automatically, plugs straight into your ESG platform and exports in one click. Legacy reporting tells a story, Ozomark tells the truth.
- Built for the 2027 NHS gateGHG Protocol aligned, DEFRA/DESNZ factors applied
- Scope 1, Scope 3 Cat 6 and 7Fleet, business travel and commuting in one platform
- Enterprise-grade. UK data residency.Hosted in London. Built to UK GDPR and NHS data standards.
- CRP-ready export, out of the boxDrop straight into your Carbon Reduction Plan
38 weeks to 1 April 2027
Anyone can report a number. Only measured data can show a reduction.
Your CRP reports a baseline year and a reporting year. A measured baseline moves as staff travel changes, so you have a real reduction to show. A spend proxy moves with budgets, not behaviour, so it has nothing.
Reported staff-travel emissions, baseline to reporting year · Illustrative
The CRP is not scored or ranked against other suppliers. Where it gates a procurement it is pass or fail, the same bar every year. What changes is what you can show between your baseline and reporting year: measured data builds a real downward trend, a spend proxy moves with budgets, not behaviour.
1 April 2027
All relevant Scope 3 comes into scope
Business travel and commuting are named in. Leaving a category out needs a justification aligned to the GHG Protocol, and a spend proxy with no activity data underneath it is not one.
Baseline to reporting year
A baseline you can actually verify
Start now and your baseline and reporting year are real data. Start in 2027 and your baseline is an estimate, so your reduction is estimate versus estimate, not something you can verify.
The data-quality ladder
Measured is primary data
The GHG Protocol ranks measured, activity-based data above spend-based and average-data estimates. Ozomark puts your two weakest categories on the top rung.
Estimates report a number. Measured data reports a reduction you can stand behind.
Source: NHS England, 2027 NHS carbon reduction plan requirements for the procurement of NHS goods, services and works, and Market sounding findings: net zero supplier requirements from April 2027 (9 June 2026). GHG Protocol Corporate Value Chain (Scope 3) Standard. NHS England · Greener NHS
A pass is not a win
A travel number you cannot defend is a liability on your books.
Spend-based estimation is permitted, and that is the trap. It clears the line on paper, then leaves you with a board-approved, published staff-travel figure you cannot substantiate when a commissioner, an auditor or a rival asks how you got it. A proxy barely moves when your people change how they travel, so it cannot evidence the reductions the whole agenda runs on.
Staff surveys
Spend-based tools
Ozomark
Data basis
Staff surveysRecall
Spend-based toolsSpend proxy
OzomarkMeasured
Mode-level Scope 3 detail
Staff surveysPatchy
Spend-based toolsNone
OzomarkPer mode
Shows year-on-year reductions
Staff surveysDrifts
Spend-based toolsSpend, not travel
OzomarkTracked
Stands up to audit
Staff surveysUnverifiable
Spend-based toolsNo travel link
OzomarkReproducible
Staff privacy
Staff surveysExposes
Spend-based toolsBlunt
Ozomarkk-anonymised
Effort on staff
Staff surveysChasing
Spend-based toolsProxy only
OzomarkPassive
Estimates buy you a pass this cycle. Measured data is the only travel number you can still stand behind when someone checks.
Measured travel, not a survey guess.
Staff record trips on their phone. The classifier turns raw movement into transport modes on the device. Only mode and distance leave it. You get carbon, never a map.
Step 02
Off the device, coordinate-free
Only mode and distance sync. No coordinates, no home address, no record of where anyone was.
Step 03
On your dashboard
We apply the versioned UK Government GHG Conversion Factors (DEFRA/DESNZ) and aggregate to k-anonymised cohorts. The numbers drop straight into your CRP, or the carbon platform you already run.
Inside the classifier
The hard part is being right about every leg.
Twenty-plus signals separate car from bus from rail from walking, snap rail journeys to the line you actually rode, and rebuild the trip through tunnels and dead zones. That is what turns a phone in a pocket into a distance an auditor will accept.
- Evidence-accumulation scoringEvery signal votes. The strongest case wins.
- 20+ signals per legSpeed, bearing, altitude and accuracy, all fused.
- 12 transport modesWalk to tube, bus to ferry, all told apart.
- Infrastructure-awareEvery UK stop and rail line, bundled and offline.
- Rail-track snappingKnows which line you rode, not just that it was rail.
- Underground reconstructionRebuilds the journey where the signal dies.
- Cold-start recoveryRecovers the start before tracking woke up.
- Complete-timeline guaranteeNo blank spots. Every metre accounted for.
Classified on-device
- 0
- transport modes told apart
- 0+
- signals fused per leg
- 0%
- classified on-device
- 0
- coordinates leave the phone
The board sees the carbon. Nobody sees the journey.
The classifier runs on the device, so location never becomes your liability. You report carbon you can stand behind, and there is no movement data to lose, leak, or explain.
Raw · on device
On the employee's phone
- Raw GPS
- Precise timestamps
- Home address
Stays in on-device storage.
Aggregate · leaves device
What Ozomark receives
- Aggregated tCO2e
- k-anonymised
- Coordinate-free
Aggregated. Coordinate-free.
- Raw GPS stays on the phoneCoordinates and home never leave the device. The server schema has no location columns.
- Only aggregates reach youCohorts are k-anonymised. No tier, ever, can drill into one person's trip.
- A lighter compliance loadNo individual-level travel data reaches your systems, so your UK GDPR exposure is limited to aggregated, k-anonymised outputs, not personal location history. You remain the controller, with a cleaner DPIA starting point.
- Worker controls, documentedOpt-in controls for staff, and we help you document the legitimate-interests assessment.
Start measuring before you have to report it.
A credible CRP needs a baseline year and a reporting year of real travel data. You cannot backfill journeys that already happened. The teams that start now will have a defensible number when the gate goes live.
Start your free baseline
No booking page configured yet. The button opens your mail client.
A 20-minute briefing. Your own dashboard, live in days. No data leaves your staff's phones.