How Do Walking Apps Track Distance?

Walking apps track distance in two main ways: by using GPS to record your position and adding up the distance between points, or, when GPS is not available, by counting steps and multiplying by an estimated stride length. GPS is generally better outdoors, and step-based estimates are the fallback indoors.

Method 1: GPS

Your phone receives signals from satellites and works out its position every second or so. The app records a series of positions, removes obviously wrong ones, and adds up the distance between them. Some phones also combine GPS with Wi-Fi, mobile networks and motion sensors to improve the position.

Method 2: Steps and stride length

The accelerometer detects the rhythm of walking, and the phone counts steps. Distance is then estimated as steps multiplied by stride length. Stride length is either entered by you or estimated from your height, so it is an approximation. It varies with pace, slope and how you walk.

Why GPS can be off

• Tall buildings reflect signals and shift your apparent position.
• Tree cover and tunnels weaken signals.
• The first seconds after starting can be noisy until the phone locks on.
• Apps smooth the track differently, which changes the total slightly.

Why steps can be off

• Stride length is an estimate.
• Phone carried in a bag may count steps less reliably.
• Slopes and different paces change stride.

Which should you use?

For outdoor walks, GPS. For treadmill or indoor walking, steps. Read how accurate phone walking trackers are.

What “sensor fusion” means

Modern phones do not rely on a single source. They combine satellite positioning with other information, such as motion sensors and nearby Wi-Fi or mobile networks, to produce a smoother, more reliable position. When a signal drops for a moment, motion sensors can fill the gap. The details differ between phones and apps, which is one reason results vary.

Smoothing and filtering

Raw position points jump around by a few metres. If an app simply added them up, the total would be too long, because every tiny jump counts as distance. Apps therefore filter out unlikely points and smooth the path. A stronger filter gives a cleaner but slightly shorter route. A weaker one follows every wobble.

A quick experiment

1. Choose a measured route, such as a track or a stretch with known distance.
2. Walk it twice with the same app, once with the phone in your hand and once in a bag.
3. Compare the totals.

The difference shows you how much placement matters on your phone.

Where HALEBIT fits

HALEBIT shows both kinds of number. Steps today on the Now screen come from all-day step tracking, which you can switch off in Settings. A recorded walk uses your phone’s location for the route and distance, and indoor modes such as Indoor do not use GPS at all. Available detail depends on your phone and the permissions you allow.

See the walking tracker page or explore HALEBIT →

Keep reading

• How to track walking distance on Android
• Walking tracker vs step counter
• GPS running tracker: how it works

Quick questions