To track your commute with GPS, start a trip meter as you leave and save it when you arrive. You get the real distance, total time, time actually moving and your average moving speed, which is enough to compare routes, check an e-bike’s range, or keep a mileage record. Record the same route three to five times before you judge it: day-to-day traffic moves the numbers far more than GPS error does.
What can a GPS trip meter tell you about your commute? #
A basic trip meter records more than distance. The most useful numbers for a city commute are:
- Distance: how far you actually travelled, including detours.
- Total time: door to door, from Start to Save.
- Moving time: only the seconds you were actually moving.
- Average moving speed: distance divided by moving time.
- Top speed, and a speed chart over the trip showing where you crawled.
The gap between total and moving time is the interesting part in a city. It’s the time you spent stopped at lights, in queues and at junctions.
Here’s how one 12 km commute might break down (example figures):
| Value | |
|---|---|
| Distance | 12.0 km |
| Total time | 38 min |
| Moving time | 27 min |
| Time stopped | 11 min |
| Average moving speed | 26.7 km/h |
| Average speed door to door | 18.9 km/h |
How to set up a GPS trip meter for your commute #
Speedometer GPS does this with four buttons: Start, Stop, Reset and Save. Set it up before you leave:
- Mount the phone. Dash or vent mount in a car, handlebar mount on a bike or e-scooter. It needs to be secure and able to see the sky.
- Open the app and wait for a fix. The GPS pill under the readout should say GOOD or EXCELLENT.
- Check the unit. km/h with km, mph with miles, or knots with nautical miles if your commute is by boat.
- Set a speed alarm if you want one, for example your e-scooter’s legal limit. It’s off by default.
- Press Start as you set off.
- When you arrive, press Stop, then Save. The trip goes into Trips with its distance, times, top and average speed, the route and a speed chart.
Two honest limits. The app only records while it’s open on screen, and by default it keeps the screen on while you’re tracking, so plug in for longer commutes. And if the app gets closed mid-trip, it offers to resume the trip when you next open it, as long as it’s within 12 hours.
Once you’ve pressed Start, leave it alone. Nothing needs a tap until you arrive.
How do you compare two commute routes fairly? #
- Record each route three to five times, at your usual time of day and day of week.
- Compare moving time and total time, not just distance.
- Look at the speed chart for each: long flat sections near zero show where the delays are.
- Pick the route with the best typical total time, or the most predictable one if being on time matters more than being quick.
A worked example of the same trip by two routes:
| Main road | Back streets | |
|---|---|---|
| Distance | 9.8 km | 11.4 km |
| Total time | 31 min | 29 min |
| Moving time | 19 min | 26 min |
| Time stopped | 12 min | 3 min |
| Average moving speed | 31 km/h | 26 km/h |
The longer route is slower while you’re moving and still gets you there sooner, because it barely stops. On a bike that difference is usually bigger, and the quieter route often wins on effort as well as time. In a car, the speed chart shows which single junction is costing you the most.
What skews GPS commute data in a city? #
Three things, and only the third one really moves the total:
- Tall buildings bounce signals, so the recorded track can zigzag and read slightly long, and speed can spike for a second.
- Starting in an underground car park means no fix at all. Start the trip once you’re outside.
- Long tunnels and underpasses leave a gap. After five seconds without a fix the reading drops to 0 and says SEARCHING, and Speedometer GPS won’t add the distance across any gap longer than 200 m, so a tunnelled commute comes out short by roughly the length of the tunnel, every single day.
That last one is consistent rather than random, so it doesn’t spoil a route comparison; it just means the app’s number is lower than your odometer’s. GPS speed in tunnels and cities explains what the app can and can’t measure underground, and why GPS trip distance doesn’t match your odometer covers the rest of the gap.
Mixed-mode commutes #
GPS keeps working on buses and above-ground trains, especially near a window, but not on underground metro lines. Walking legs barely count, though. Speedometer GPS ignores steps under 5 m between one-second fixes, so anything slower than about 18 km/h (11 mph), including walking and a slow bike or scooter crawl, under-counts. Note walking distances separately, or estimate slow legs from average speed × moving time.
The app doesn’t detect whether you’re walking, riding or on a train. You can record the whole journey as one trip, or save each leg as its own trip: at the end of a leg press Stop, then Save, then Reset, and press Start when the next leg begins. Skip the Reset and the next saved trip will include the previous leg’s distance too. Reset vs save for multi-leg trips explains the order and what each button touches.
What to do with your commute data #
- Weekly and monthly distance: the Trips screen adds up every saved trip into a lifetime odometer, up to 100 trips. GPS odometer app explains how that total behaves once you pass the limit.
- E-bike and scooter range: knowing your real commute distance tells you how many days you get from a charge.
- Car running costs: multiply weekly distance by your fuel or energy cost per km.
- Mileage records: each trip can be exported as a GPX file or shared as a card. Whether GPS logs are enough for a tax or expense claim depends on your employer or tax authority; see exporting trip distance for tax records.
Frequently asked questions #
How accurate is GPS for measuring my commute? #
On open roads, GPS distance is close to the real distance. Downtown it can read slightly long from signals bouncing off buildings, and long tunnels leave gaps. Over several commutes the errors average out, so route comparisons are reliable even when the absolute number is a little off.
Why is my commute distance different every day? #
Small changes in your route, lane and stops add up, and GPS errors vary from day to day with satellite positions and traffic around you. A difference of a few hundred metres on a 10 km commute is normal.
Can I track my commute automatically? #
Some apps detect trips automatically, but that needs background location access. Speedometer GPS is deliberately manual: it uses location only while it’s open, and you press Start and Save yourself.
Does GPS track distance on the subway? #
No. GPS signals don’t reach underground. A GPS trip meter will show a gap for the underground part of your journey.
How do I log commute miles for work? #
Save each trip and keep the records your employer or tax authority asks for, which is often start and end odometer readings plus the purpose of the trip. GPS trip logs with dates and distances are useful supporting detail.