GPS speed, accuracy, and the science behind the numbers — explained simply, with no jargon.
Total distance over total time — plus the averaging mistake almost everyone makes, and why it is always wrong in the same direction.
Read the article →Work out any one of speed, distance or time from the other two, with worked examples and a reference table of common journey speeds.
Read the article →What counts as an average running speed by race distance and age, and the three things that actually move your pace.
Read the article →Typical cycling speeds by rider level, bike type and terrain — and why wind matters more than fitness on any given day.
Read the article →How fast the average person walks, jogs, runs and sprints, and why humans are poor sprinters but exceptional endurance movers.
Read the article →The typical jogging pace, where jogging ends and running begins, and why the conversational test beats any fixed number.
Read the article →Sprint speeds for untrained adults and athletes, how they compare with Usain Bolt, and why nobody holds top speed for long.
Read the article →Why a completed lap of a track has an average velocity of exactly zero, and when the distinction actually matters.
Read the article →Cruising speeds for commercial jets, why airspeed and ground speed differ by hundreds of km/h, and whether your phone can measure it.
Read the article →F1, NASCAR, IndyCar and Le Mans top speeds — and why average lap speed is often half the headline number.
Read the article →Your dashboard says 60, your phone says 57 — and both can be "right." Here's the actual reason car speedometers and GPS speed readings disagree, and which one to trust.
Read the article →GPS doesn't have a built-in speedometer — it has to work your speed out indirectly. Here's how that actually happens, in two different ways, without the textbook jargon.
Read the article →Getting a jumpy or wrong GPS speed reading? These are the real, fixable reasons — and the simple habits that get you a tighter, more trustworthy number every time.
Read the article →A wheel-sensor bike computer and a GPS speedometer rarely agree exactly. Here's which one drifts more over a ride, and why.
Read the article →Pace and speed measure the same thing two different ways. The math connecting your splits to a live speed number, made simple.
Read the article →GPS works fine through a train window but drops instantly in a tunnel. Here's why, and how fast trains actually go.
Read the article →Bike speedos over-read for the same legal reason cars do, but tyre wear and gearing swaps push the error further on two wheels.
Read the article →Why sailors measure speed in knots, and the real difference between speed through water and speed over ground.
Read the article →Walking speed shifts predictably across a lifetime and is even used as a clinical health marker. What's typical, and how to measure your own.
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