What your drive statistics actually mean
The ride is over and you are looking at a wall of numbers. Average speed 52, top speed 87, elevation 186 metres, moving time 27 minutes. What do they actually tell you, and which ones matter? Here is what sits behind each figure.
Distance
Distance is the sum of the gaps between recorded position points. The app samples your location every few seconds, measures the ground distance between each consecutive pair and adds them up.
That is why GPS distance and your vehicle's odometer rarely match exactly. The odometer counts wheel rotations and is affected by tyre pressure and wear. GPS adds up straight-line segments, so on roads with tight, frequent corners it can read slightly short. The gap is usually one to three percent.
Average speed
There is a crucial distinction here: average over which time?
- Overall average: total distance divided by total elapsed time. Minutes spent in traffic, refuelling or stopping for coffee are all in the denominator. City rides produce low numbers here.
- Moving average: total distance divided by time actually spent moving. This reflects your riding pace far more accurately.
When comparing two rides, make sure you are comparing the same kind of average. A city ride might show 25 km/h overall and 45 km/h moving. Both are correct; they measure different things.
Top speed
This is the highest instantaneous speed recorded during the ride, and it is the figure most prone to error, because a single bad position point can pull it upward.
Coming out of a tunnel, for instance, the phone re-acquires its position and may briefly jump, which the app can read as a momentary spike. Good apps filter these outliers, but top speed is still better treated as a rough indicator than a precise measurement.
Top speed is interesting, not a target. Exceeding speed limits is dangerous and carries legal consequences. Ride tracking apps exist to record the journey, not to encourage racing.
Moving time and idle time
The app marks periods where speed drops below a threshold and stays there as idle. Waiting at a red light usually does not count because it is too brief, but a fuel stop or a lunch break does.
The value of this split is practical: on a long tour you can see how much of the day was genuinely spent on the road. If eight hours breaks down into six moving and two stopped, that is useful information for planning the next trip.
Elevation and total climb
Elevation can come from two sources. Satellite-derived altitude is comparatively imprecise and can be off by tens of metres. The barometric pressure sensor in an iPhone measures altitude change from air pressure and is considerably more accurate.
Watch for two different numbers:
- Total climb: the sum of every uphill section during the ride. Even if you start and finish at the same altitude, this will not be zero.
- Maximum altitude: the highest point reached along the route.
On mountain roads, total climb describes the difficulty of a ride better than distance does. Fifty kilometres of switchbacks can be far more demanding than a hundred kilometres of flat motorway.
How to read the numbers
The figures from a single ride say very little in isolation. The value appears in the trend over time.
- Compare like with like. Putting the averages of different routes side by side is misleading. Use a route you ride often as your reference.
- Watch monthly totals. How much you ride is a more meaningful measure of habit than any individual ride.
- Look at the idle ratio. On long tours, seeing how your break pattern changes makes planning easier.
- Read elevation alongside distance. Together they describe the real character of a route.
Rovia calculates all of these automatically after every ride and keeps them alongside your history, so tracking the trend does not require a spreadsheet.
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Frequently asked questions
Why is GPS speed different from my speedometer?
Vehicle speedometers read slightly high by design, within a legally permitted tolerance. GPS is usually closer to true speed but varies with signal quality. Neither should be used as a definitive reference for speed limits.
Why is my average speed so low?
You are probably looking at the overall average, which includes stops and time in traffic. For riding pace, look at the moving average instead.
Why does elevation sometimes show odd values?
The barometric sensor measures air pressure, so sudden weather changes and temperature differences can cause small drifts. A few metres of variation on short, flat routes is normal.
How is total climb calculated?
It is the sum of all sections where elevation increased. Descents are not subtracted, which is why the figure is not zero even on a loop that returns to its starting point.
What counts as idle time?
Time where speed falls below a threshold and stays there. Brief stops at traffic lights usually do not cross that threshold.