GPS tracking is the foundation layer of fleet telematics: where the vehicle is, where it has been, how fast it was going. It is mature, inexpensive and widely misunderstood — both over-sold as a management panacea and under-used once installed.
How accurate is it really
Consumer-grade GNSS receivers in fleet devices typically achieve horizontal accuracy of a few metres in open conditions. That degrades meaningfully in:
- Urban canyons — tall buildings reflect signals, producing errors of tens of metres and apparent jumps between streets.
- Under cover — multi-storey car parks, loading canopies, tunnels.
- Dense foliage.
- Cold starts — the first fix after a long power-off can take longer and be less accurate.
Modern devices mitigate this with multi-constellation reception (GPS plus Galileo, GLONASS, BeiDou) and dead reckoning from vehicle motion sensors. When evaluating, ask which constellations are supported and whether dead reckoning is included — it matters in cities and in tunnels.
Practical implication: do not build processes that require sub-10-metre certainty. Geofences of 25–50 metres around sites, arrival detection with a dwell requirement, and tolerance in reporting all reflect physical reality.
Arrival and departure times captured by geofence are more accurate and more complete than driver-entered times, because they require nothing from a busy person.
Reporting frequency and what it costs
Devices report on an interval, on an event, or both. Common configurations:
| Configuration | Typical use | Trade-off |
|---|---|---|
| 30–60 second interval while moving | General fleet visibility | Good balance |
| 10 second interval | Dispatch-critical, high-value cargo | More data, more cost |
| Event-based (start, stop, turn, harsh event) | Battery-powered assets | Sparse tracks between events |
| Daily position | Trailers, plant | Very long battery life |
Higher frequency means more accurate distance calculation, better route reconstruction and more data cost. For most delivery operations, 30–60 seconds while moving plus event triggers is entirely sufficient.
Geofencing: design matters
Geofences are the mechanism that turns raw position into useful events — arrived, departed, entered a restricted area, left the depot.
Design rules that prevent the common problems:
- Size for the site, not the map. A geofence must cover the whole yard, including where drivers actually park, which is often not where the pin is.
- Require dwell time before triggering arrival. Without it, a vehicle passing the entrance registers as a visit.
- Use exit as the completion event rather than a manual driver action where possible; it is more reliable and requires nothing from the driver.
- Beware overlapping fences in dense areas — a retail park with six customers needs careful boundaries or you will record the wrong arrival.
- Review fences quarterly. Sites move, entrances change, and stale fences produce silently wrong data.
Geofence-derived arrival and departure times feed service time models, which makes their accuracy more consequential than it first appears.
What tracking genuinely delivers
- Dispatch visibility — answering "where is it?" without a phone call.
- Customer ETAs — the single most requested capability and the one with the clearest customer-satisfaction return.
- Proof of attendance — settling disputes about whether a vehicle was on site, and for how long.
- Distance for cost allocation and for mileage-based maintenance.
- Route adherence — whether the plan was followed, and where it was not.
- Unauthorised use detection — out-of-hours movement, personal use of company vehicles.
- Recovery after theft, though dedicated stolen-vehicle recovery services are stronger for this.
What it does not deliver
- It does not tell you why. A vehicle stationary for 40 minutes may be waiting at a customer, in traffic, or taking a break. Without context from the driver app, location data is ambiguous.
- It does not improve productivity by itself. Visibility without a management process changes nothing.
- It does not make drivers safer. Behaviour data plus coaching does; the data alone does not.
- It rarely proves fraud on its own. It produces evidence that supports an investigation, which is different.
Using it without poisoning the culture
The fastest way to waste a telematics investment is to introduce it as surveillance.
- Explain the purposes, in writing, before installation.
- Restrict who can view live location, and log access.
- Do not use minute-by-minute location for performance management; use aggregated, fair metrics.
- Provide a privacy mode for permitted personal use, and honour it.
- Show drivers the benefits that accrue to them: fewer disputed timesheets, evidence when a customer claims a late arrival, faster help when a vehicle breaks down.
- Involve driver representatives before rollout, not after the first grievance.
Operations that do this get accurate data and cooperative drivers. Operations that do not get disconnected devices, disputes and a system nobody trusts.
Frequently asked questions
Can drivers disable the tracker?
Plug-in OBD devices can be unplugged, which is one reason hardwired installation is preferred where tamper resistance matters. Most systems report power disconnection as an event; the appropriate response is a management conversation, not an escalating technical arms race.
How long should location history be retained?
Only as long as you have a documented purpose. Many fleets settle on 90 days of granular position data with longer retention for aggregated trip summaries. Indefinite retention of detailed employee movement is difficult to justify under most data protection regimes.
Is GPS tracking accurate enough for billing customers by time on site?
With well-designed geofences and dwell thresholds, generally yes, and it is more defensible than driver-entered times. State the method in your contract terms, and expect to handle occasional disputes where signal conditions degraded the reading.
Does tracking work everywhere?
Position acquisition requires sky view; data transmission requires cellular coverage. Devices buffer positions when out of coverage and upload later, so history is preserved even if live tracking gaps appear. Underground and deep indoor locations will not report live.
What is the difference between GPS tracking and telematics?
Tracking is location. Telematics adds vehicle data — engine, fuel, diagnostics, behaviour — and the analytics around it. Most products marketed as tracking today include some telematics, but the depth varies enormously.
