An inaccurate GPS trip route can come from weak or reflected satellite signals, interrupted recording, location permissions or the map underneath the route. First identify whether you are seeing a wandering line, a missing section or an isolated jump. Then check the phone while safely parked. A strange line alone is not proof that you drove off the road.
For a personal driving journal, the useful question is whether the saved trip is reliable enough for the comparison you want to make. You may still remember where you went while being unable to trust one section of the route. Keep that uncertainty attached to the trip.
Recognize the pattern before changing settings
Use these as investigation prompts, not diagnoses. Different problems can produce a similar picture.
- Drift: the trace wanders beside the road or zigzags around one area. Look for tall buildings, an underground start or other obstructions.
- Gap: part of the journey has no recorded route. Check whether recording stopped, usable positions were unavailable or the app reports incomplete coverage.
- Jump: one point or short section leaps away and returns. Review the points before and after it before treating it as a real detour.
- Map mismatch: the trace seems plausible but a road, address or entrance looks wrong. The underlying map may need correction.
The archived GPS.gov accuracy guide distinguishes blocked or reflected GPS signals from errors in mapping software. Buildings, bridges and trees can obstruct reception; reflected signals can also distort a position. A map can separately contain a missing road or an incorrect address.
The GPS.gov page is an older technical reference, last modified in 2022. It is useful for these underlying causes, not as a current benchmark for any particular phone or an accuracy promise for Roadsy.
Why tunnels and city streets can distort a trip
Imagine a drive leaving an underground garage, passing between office towers and then reaching an open road. The beginning and middle can have very different recording conditions from the final stretch. Do not assume that one good section makes every earlier point equally dependable.
For a second explanation of the mechanism, Strava's GPS troubleshooting guide describes how obstructions block reception and how signals bouncing off buildings can cause sudden position errors. That explains a possible source of a distorted trace; it does not establish the cause of a specific Roadsy trip.
If a renderer connects the last point before a gap with the next point after it, the connecting line can cut across a bend or a block. That line describes the connection between observations. It cannot establish which path the vehicle took through the unobserved section.
A parked Android checklist for the next trip
Make changes before setting off or after parking safely. Do not handle the phone while driving to test whether a route is improving. Menu names vary by Android version and phone manufacturer.
1. Check the app's location permission. Open Settings, find the app, and review Permissions, then Location. Android separates approximate from precise access on supported versions. Use the access the recording feature needs and follow its setup instructions. See Google's app location permission guide. Granting location access does not by itself guarantee a complete background recording.
2. Review the device's Location Accuracy setting. On many Android 12 and later devices, it is under Settings, Location, Location services, Location Accuracy. Google explains that this service can combine GPS, Wi-Fi, cellular signals and sensors to improve estimates. It is separate from an individual app's precise-location permission. Read how Android Location Accuracy works before changing it: enabling the service also involves Google collecting location-related signal and sensor information.
3. Check the current position in another map app while parked. In Google Maps, a large blue accuracy circle means the position is uncertain. Google also recommends checking Battery Saver when the location jumps and restarting the phone if problems persist. Follow its location troubleshooting steps. These are diagnostic checks for the phone, not a guarantee that another app's saved trip will match Maps.
4. Compare the circumstances. Does the issue happen only after an underground start, in the same built-up area, or when recording runs in the background? Note one pattern at a time. A position that looks correct now does not prove that background recording worked earlier.
5. Review the next ordinary trip after parking. Keep the phone securely placed and use the app's normal setup. Change one setting at a time so that the comparison is useful. Avoid clearing app storage or reinstalling as an initial experiment when you have local trips you want to keep.
How to review a questionable trip in your driving journal
Start with the trip's broad context: the date, approximate departure and arrival, and the journey you remember. Then locate the questionable section. Decide which observations you can use and which need to remain uncertain.
For example, suppose a familiar commute normally covers roughly 12 km, but one saved route includes a sharp excursion through buildings. That is an illustrative anomaly to investigate, not a measured Roadsy result. Compare the surrounding route and available trip details before deciding whether it represents travel, a recording problem or a display issue.
Do not silently replace the route with the one you expected, or delete the whole trip just to make the history look tidy. If you keep a separate note, record what you know and what you do not: 'Usual commute; route jumps near the garage exit; exact distance uncertain.' This suggestion does not depend on an in-app notes feature.
Roadsy's trip-tracking overview explains the product's approach to saving journeys. Use the information available in your version to check trip status and coverage. For the separate question of interpreting feedback, see how driving scores work. A route anomaly is a reason to examine the evidence behind a result, not an automatic explanation for every change in a score.
When to report an issue
If the problem repeats in open areas, occurs on several ordinary trips or appears only in one app, collect a small, useful report. Include the phone model, Android version, app version, approximate trip time, the pattern you see and whether the app was recording in the background. Mention any permission or battery-setting changes you already tried.
Share only the route excerpt needed to show the problem. Crop home and work endpoints, remove unrelated journeys and avoid posting a full location history publicly. Keep your original record while support investigates.
Use Roadsy support for Roadsy-specific reports. A clear description of where the trace becomes unreliable is more useful than a claim that the entire GPS system is broken.
Common questions about inaccurate GPS routes
Can I recover the exact route from a gap? A line on a map cannot recover observations that were never captured. An app may be able to restore previously saved detail, but that is a different issue from a recording gap. Ask support to distinguish missing stored detail from missing measurements before assuming either is permanent.
Will compass calibration repair an old trip? It should not be treated as a repair for saved route data. Google's compass advice addresses the direction of the current Maps beam. That is a different problem from reconstructing an earlier journey.
Should I change phones after one bad route? One trip is too little evidence for that decision. Record when the issue happens, try the parked checks and look for repetition. If several location apps remain inaccurate in ordinary open conditions, the phone manufacturer's support is a reasonable next step.
Can a distorted trace prove speeding or unsafe driving? A route line alone is insufficient. Interpreting an event needs reliable measurements and context; a personal journal should leave room for uncertainty.
Use a trip record to understand your own journeys, with its limitations visible. Visit Roadsy's feature overview for the current product scope and availability.
Sources checked September 19, 2026. Android settings and support instructions can change; consult the linked Google guidance for your device.