You park your vehicle, switch off the engine and leave it in exactly the same position. A few hours later, you open the tracking application and notice something confusing: the vehicle icon appears to have moved several metres, the map shows a tiny trip or the reported speed briefly changes even though nobody has driven the car. For motorists and fleet managers using GPS tracking in Kenya, this behaviour can raise immediate concerns about tracker accuracy or unauthorised vehicle movement.

In many cases, however, the vehicle has not actually moved. The apparent movement may be caused by a normal GPS phenomenon commonly known as GPS drift. A tracking device estimates its position using signals received from navigation satellites, and that position can vary slightly from one reading to another. When the vehicle is stationary, two consecutive coordinates may therefore appear several metres apart even though the tracker has remained in exactly the same place.

GPS positioning is highly useful but it is not perfectly exact down to the centimetre under normal vehicle-tracking conditions. Buildings, trees, roofs, parking structures and other obstacles can affect how clearly satellite signals reach the tracker. A car parked between tall buildings in Nairobi, for example, may experience more position variation than a vehicle parked in a wide open area with a clear view of the sky. Reflected satellite signals can also influence the calculated position.

This becomes more noticeable when the vehicle is parked for a long time. The tracking platform may plot several slightly different coordinates around the same location, creating what looks like a small cluster of movement. If those points are connected on the trip history, the map may appear to show the vehicle travelling around the parking area even though it never left its space. Fleet managers should therefore look at the scale of the movement before concluding that an unauthorised trip occurred.

Ignition information can provide important context. If the map shows a small location change while the ignition remains off and there is no meaningful route away from the parking area, GPS drift is one possible explanation. If the tracker shows the ignition turning on, the vehicle travelling several kilometres and later returning, that is a very different event. Good fleet monitoring involves examining several pieces of information together rather than relying on a single map point.

Very low reported speeds can sometimes result from the same effect. When the tracker calculates a slightly different position several seconds later, the platform may interpret the difference as movement. Depending on the device and software configuration, this may occasionally create a very small speed value even when the vehicle is stationary. Significant or sustained speed readings, however, deserve closer investigation.

The tracker’s installation location can also influence positioning performance. GPS signals need to reach the device effectively, which is why professional installers try to balance concealment with reliable signal reception. Hiding a tracker underneath excessive metal shielding or in a poorly chosen part of the vehicle may reduce satellite visibility. A device that repeatedly produces abnormal location behaviour should therefore be inspected rather than simply assuming every inaccurate point is normal GPS drift.

Underground parking areas provide another common example. A vehicle may enter a basement where satellite reception becomes weak or unavailable. The tracking platform may continue showing the last reliable outdoor position until the tracker obtains a new location after leaving the basement. Depending on the system, the new point may appear some distance away from the previous one, making the trip history look unusual until the complete sequence is reviewed.

The same principle applies when a vehicle is transported inside a building, container or another environment where satellite signals are heavily obstructed. GPS tracking relies on receiving suitable navigation signals, while the tracker usually also needs mobile-network communication to send information to the platform. Weakness in either part of this process can temporarily affect what the authorised user sees on the screen.

Fleet managers should therefore concentrate on patterns rather than isolated map movements. A few metres of movement around the same parking location is very different from a vehicle travelling along identifiable roads. Check the timestamps, ignition status, trip duration, route history and whether the vehicle entered or exited an established geofence. Taken together, these records can usually provide a much clearer explanation than the map icon by itself.

Geofencing should also be configured sensibly. If the virtual boundary around a parking location is extremely small, ordinary GPS variation may occasionally place the reported position outside the boundary even when the vehicle has not meaningfully moved. Creating an appropriate geofence radius around a home, office, depot or yard can reduce unnecessary alerts while still providing useful notification when a vehicle genuinely leaves the area.

Businesses should pay particular attention if the reported movement becomes large, repetitive or inconsistent with normal GPS behaviour. If a parked vehicle repeatedly appears hundreds of metres away, the tracker frequently loses its position or the trip history becomes unreliable, technical inspection may be necessary. Possible causes can include poor installation position, antenna problems, device faults, power issues or environmental conditions affecting reception.

A professional tracking provider should be able to distinguish between expected positioning variation and a system that genuinely requires attention. This is particularly important for fleet operators making operational or disciplinary decisions from tracking information. GPS data can be extremely valuable, but it should be interpreted in context rather than treating every coordinate as an exact physical measurement.

Finatrack Global Ltd provides professionally installed GPS tracking solutions for private vehicles and commercial fleets in Kenya. Finatrack’s wired GPS tracker is available at KES 15,000, with location monitoring, trip history, geofencing and selected alerts depending on the configured solution. Professional installation helps position the device for both discretion and reliable communication. For installation or technical support, call or WhatsApp 0723 645 810 or visit www.finatrack.co.ke. If your vehicle appears to move slightly on the tracking map while it is parked, the first question should not automatically be whether someone drove it, but whether the pattern represents genuine travel or normal GPS position variation.