Passive timing, explained plainly
What passive time tracking is, when it suits your event, and how reusable tags cut cost and waste, without the jargon.
Recognised bodies our timing technology has supported
Passive and active timing both have their place. This page explains the difference in plain English, when each suits your event, and how Barefoot’s reusable-tag approach keeps cost and waste down, so you can choose the right setup rather than the most expensive one.
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Passive vs active timing, explained plainly
Passive timing uses a tag with no battery that’s read as it passes a mat, which is reliable, low-cost and ideal for start and finish lines and most road and fun-run events. Active timing uses a powered tag that broadcasts, which suits continuous tracking on course, like some trail and multi-checkpoint events. Neither is universally better; the right choice depends on your course, your budget and what you want to show participants. The honest answer for most events is passive at the key points, with live tracking added where the course needs it, and reusable tags to keep cost and waste down.
The honest comparison
No battery. Draws power from the antenna as it crosses a timing point.
Carries a battery and transmits continuously.
On the bib, or a reusable ankle or shoe tag.
A larger tag, usually on the ankle.
Low. Disposable inlays are cents; reusable tags are a fixed cost.
Far higher, and every tag has to come back.
Walking to running pace, across a mat or loop.
High speed, and through water.
Road, fun run, trail, most mass-participation events.
Cycling, motorsport, swim exits, tight sprint finishes.
❌ Reads at the points you place.
✅ Broadcasts between points.
Not needed for disposables.
Always. Budget for a loss rate.
✅ Passive at the key points, with tracking added where the course needs it.
Where speed, water or continuous visibility make it necessary.
Neither is better. The right answer depends on your course, your budget and what you want participants to see.
How Barefoot approaches it
Honest advice on passive versus active, matched to your course and budget, not a default upsell.
Reusable tags that cut the cost and waste of single-use chips.
Live tracking added where your course actually needs it, like remote trail events.
One system with registration, so whatever you choose, entries and results line up.
Who it’s for?
Organisers researching how race timing works.
Trail and multi-checkpoint organisers weighing tracking options.
Anyone wanting the right setup rather than the most expensive.
Features
Passive timing, plainly explained
A no-battery tag read over a mat, ideal for start and finish lines and most events.
Active and live tracking
Powered tags and live tracking for continuous, on-course visibility where it’s needed. See Real-Time Race Tracking.
Reusable tags cut cost and waste
Barefoot’s reusable-tag approach avoids the ongoing cost and landfill of single-use chips.
Advice, not an upsell
We recommend the right setup for your event, not the priciest one.
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Frequently Asked Questions
What is passive timing?
A tag with no battery that’s read as it passes a timing mat, reliable and low-cost, ideal for start and finish lines.
How is active timing different?
Active tags are powered and broadcast, which suits continuous on-course tracking, like some trail events.
Which does my event need?
Usually passive at the key points, with live tracking added where the course needs it. We’ll advise honestly.
What's the difference between passive and active race timing?
Passive tags have no battery. They draw power from the antenna as a participant crosses a timing point, then send back a unique ID that the reader timestamps. Active tags carry their own battery and transmit continuously, which reads more reliably at high speed, but they cost far more per tag and have to be collected after every event. Most road, trail and fun run events use passive timing.
Is passive timing accurate enough for official results?
Yes. World Athletics recognises three official timekeeping methods: hand timing, fully automatic timing from a photo finish system, and transponder timing for races not held entirely inside a stadium. Passive timing qualifies. For road races, recorded times are rounded up to the next whole second, so 2:09:44.322 is published as 2:09:45. Getting every finisher read matters far more than millisecond precision.
Do I need a timing point at the start line as well as the finish?
Only if you want net times. A finish-line reader on its own gives you gun time, which starts when the horn goes and works fine for small fields with a single start. A start-line reader records each participant’s own crossing, which matters once the field is big enough that people take a minute or more to reach the line. World Athletics-labelled races publish official results on gun time regardless.
What happens if a participant's chip doesn't read?
A backup layer catches it. Read rates on passive systems sit below 100 percent in real conditions, so timers run a second method: video or photo of the finish line, a manual bib recorder, or a second tag on the same bib. Two tags are the common fix, because the second read covers the participant whose bib was folded, covered by a jacket or turned to the back.
Can you time a remote course with no power or mobile coverage?
Yes, provided the equipment records locally. Passive readers timestamp reads on the unit itself, so a checkpoint keeps working with no signal and uploads when coverage returns. The real constraints are power and access. Every timing point needs its own battery supply, a site someone can physically reach, and a person to set it up — which is what makes remote trail and ultra courses expensive to time conventionally.
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