Start here: understand the session, its coverage, and which view answers your question.
Loading the session dataset…
Make sense of the laps.
M
Event outcomes
Race podium and fastest lap at a glance. Expand other sessions for their top three.
Session results
Other session summaries
Results use the final session classification. Race and sprint fastest laps use recorded timing, excluding identifiable deleted laps, pit-out laps and disqualified drivers.
Lap coverage
Recorded data
Annotated laps stay in the dataset. Derived pace and stint fits use eligible samples, with their counts shown.
Session context
What would you like to understand?
Reading the data: recorded, derived and estimated
Recorded
Lap and sector durations, stint records, race-control messages and radio audio from OpenF1. Coverage can vary by session.
Derived
Rolling pace, rankings, stint slopes and reconstructed gaps calculated from recorded data. Each view explains its sample rules.
Estimated
Qualifying mini-sector timing interpolated from location samples. It is distinct from recorded lap and sector durations.
Unflagged
A timed lap with none of this app’s annotations. It is not a guarantee of a traffic-free or representative lap.
COMPARE THE WHOLE FIELD
Field pace
Start with lap times. Use driver focus to follow one race or session.
Recorded + derived
Lap times across the field
Recorded data
Lower is faster for lap-time metrics. Driver colors identify the lines; select a chip to focus. Arrows mark values beyond the current range.
Race history · time difference
Cumulative lap durations against a fixed average-pace baseline.
Reconstructed timing
Zero is reference pace × lap count. Negative values are ahead of that pace; positive values are behind. The reference driver finishes their continuous timed sequence at zero. Select a driver chip above to focus.
Observed pace ranking
Median and fastest laps use unflagged timed samples on the chosen compound.
Derived summary
Driver
Median lap
Middle 50% · seconds
Fastest unflagged
Used / records
Rankings use the whole selected session, not just the focused driver. Fuel load, stint timing, weather and traffic are not normalized; cross-compound comparisons need extra care.
Tire strategy
Recorded stints
● Soft● Medium● Hard● Intermediate● Wet
Whole session, all compounds. Blocks show stint lap ranges; driver focus only changes emphasis.
Tire stints
Compare drivers on the same compound, then inspect each stint’s observed pace change.
MEDIUM
1. Choose a compoundTIRE VIEW ONLY
2. Choose driversNone selected
Select up to six drivers.
Lap time vs. session lap
Select a point to inspect its context.
Solid lines join laps within a stint. Dashed lines show fits to unflagged laps. Diamonds mark annotations; arrows retain off-scale values.
SESSION LAP WINDOW—
Observed stint slopes
Derived · unflagged
+ slope: laps get slower as the tire ages. − slope: laps get faster.
This is observed pace change, not isolated tire wear. Fuel burn, traffic, weather and track evolution also contribute. Each stint needs four unflagged timed laps for a fit.
Annotations and chart context Show details
Counts refer to the tire selection; a lap can have several tags. Yellow flags indicate possible exposure rather than a confirmed position match.
Selected lap records Inspect / filter
Same compound, drivers and lap window as the tire chart.
Driver
Lap
Stint / tire age
Lap time
Context
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How tire laps and fits are calculated
Lap records are joined to stint ranges. Event tags use timestamp overlap; pit-out laps use the provider flag, and pit-in laps use pit records. Opening laps, identifiable deleted times, missing times, unknown compounds and within-stint pace anomalies are labeled. Fits use at least four unflagged timed laps per stint in the displayed window. Tire age includes reported age at stint start. All recorded values remain available in Lap data.
ONE LAP, TWO DRIVERS
Qualifying
Uses the selected event’s qualifying session. Pick the session below if the event has more than one.
Same event
VS
Estimated timing
The map uses location timestamps to estimate mini-sector transit times. Recorded lap and sector durations are shown separately.
Where time was found
Estimated
Select a map segment to inspect estimated times.
LAP COMPARISON
Choose two drivers and compare laps.
Estimated cumulative delta
Positive: A ahead. Negative: B ahead. Based on location transit times at shared track distance; the estimate can differ from the recorded lap-time gap.
Track-map method and confidence
OpenF1’s mini-sector fields contain status codes, not split times. Both location traces are projected onto Driver A’s path, split into equal-distance segments, and interpolated at the boundaries. Sampling, approximate lap starts and GPS alignment affect precision. Incomplete or discontinuous coverage produces an explicit unavailable state. Differences under 0.020 seconds are ties. Team colors identify the winner; teammates use distinct shades.
Speed, delta and throttle
Recorded channels from the selected laps, aligned on one shared lap path.
Recorded + estimated
Use the slider or chart to inspect both laps.
Solid line: Driver A. Dashed line: Driver B. Speed is km/h; throttle is %. Delta is estimated from location transit times: positive means A ahead. S1/S2/S3 positions are approximate and use Driver A’s recorded sector durations. Horizontal position is shared lap progress, not measured meters.
Recorded qualifying laps
Fastest eligible lap per driver across this qualifying session.
Recorded durations
Driver
Best lap
Gap · seconds
Best S1 / S2 / S3 · seconds
Ideal lap
A lap-time leaderboard, not an official Q1/Q2/Q3 classification. Pit laps and identifiable deleted times are excluded. Ideal lap is a derived sum of the driver’s best recorded sectors and may not correspond to an actual lap.
FROM THE COCKPIT
Team radios
Choose a driver to hear the available recordings from the selected session.
Recorded audio
Original audio · no transcript text from OpenF1Coverage is a selection of transmissions, not a complete radio log. Tire and pace filters do not affect this view.
Select a driver card below to show their available audio clips.
INSPECT THE SOURCE, WITH CONTEXT
Lap data
Explore the whole selected session independently of the tire and pace selections.
Driver
Lap
Compound
Stint / age
Lap time
Context
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Race-control log —+
Original messages for the full session, in UTC. Their lap references may be the leader’s lap; app annotations match lap timestamps.
What the annotations mean
Race-control context
Safety car, VSC, red flags and possible yellow-flag exposure. Tags come from period overlap with the timed lap.
Lap context
Pit-in, pit-out and standing-start laps. These stay visible but do not enter unflagged summaries.
Data quality
Missing duration, unknown compound and identifiable deleted time. Missing values appear as unavailable.
Pace anomaly
A robust within-stint timing anomaly, not proof of its cause. A lap can have multiple tags; annotation counts need not add up to the lap total.