A vehicle tracker works in three steps. The device receives signals from GPS satellites to calculate its position, speed and heading. It then transmits that data over the mobile network (GSM/4G) to a server. The server uses a geographical information system (GIS) to turn coordinates into a recognisable place on a map, and applies rules to raise alerts.
Step one: the satellites work out where you are
The tracker contains a receiver that listens to signals from navigation satellites — GPS, and on modern units GLONASS and BeiDou as well. Each satellite broadcasts the time it sent its signal. By comparing arrival times from four or more satellites, the receiver calculates its own position, typically within about 2.5 metres.
Two things follow from this that answer common questions:
- The device only listens. It does not transmit anything to the satellites, and satellites have no idea your vehicle exists. Position is calculated in the device.
- Sky visibility matters. Underground parking, dense steel structures and deep urban canyons degrade the fix. Open road gives the best accuracy.
Once it has a position, the unit also derives speed and heading by comparing successive fixes, and reads ignition state from the wiring.
Step two: the mobile network carries the data
Knowing where the vehicle is does no good if the information stays in the vehicle. The device holds a SIM and transmits a small encrypted packet — position, speed, heading, ignition, sensor readings — at a set interval. On our platform that is every 10 seconds while moving.
This is where Pakistani conditions bite, and where cheap systems fail:
- Coverage gaps. Stretches of the interior have patchy service from any single operator. A multi-network SIM roams between operators instead of going dark.
- Store-and-forward. When there is genuinely no signal, a good device writes positions to onboard memory and transmits the whole buffered trail when it reconnects. Your route history fills in retrospectively rather than showing a mysterious straight line across thirty kilometres.
If a vendor cannot explain what their device does during a coverage gap, assume it loses the data.
Step three: the platform turns coordinates into meaning
A pair of numbers like 31.5204, 74.3587 is not useful to a dispatcher. A geographical information system maps those coordinates onto roads, landmarks, city boundaries and your own sites, so the same data becomes "on Ferozepur Road, 2 km from the Johar Town depot, heading north".
The platform layer is also where the system becomes more than a map:
- Trips are assembled from raw pings by detecting ignition on and off, so you get journeys rather than a stream of dots.
- Geofences — zones you draw — are tested against every position, so an entry or exit becomes an event.
- Rules compare readings against thresholds: speed over a limit, fuel falling while stationary, temperature above a ceiling.
- History is retained so any journey can be replayed later, which is what settles disputes.
What happens when a rule breaks
An alert is generated within seconds and dispatched by whichever channels you configured — push notification, SMS, email, or a webhook into your own system. On monitored plans it also lands on a staffed desk, which matters for theft and SOS events where a notification nobody reads is no use at all.
Data also travels the other way
Tracking is not purely one-directional. Authorised users can send commands back to the device over the same network — most importantly engine immobilisation, which interrupts the starter circuit. On a properly built system this is speed-interlocked so it can only take effect at standstill, role-gated so not everyone can do it, and logged with who issued it and when.
The short version
Satellites tell the device where it is. The mobile network carries that to a server. The server makes it mean something and watches it against your rules. Everything else — fuel probes, temperature sensors, driver cards, cameras — is additional data riding the same three steps.
If you want to see the result rather than the theory, the animated walkthrough on our homepage runs through it end to end.
The device needs mobile network coverage to transmit in real time. Without it, a good tracker stores positions in onboard memory and uploads the complete buffered trail once signal returns, so the route history stays intact.
Modern multi-constellation receivers using GPS, GLONASS and BeiDou are accurate to roughly 2.5 metres in open conditions. Accuracy degrades in underground parking, tunnels and among tall buildings where the view of the sky is blocked.
It depends on the plan and the device configuration. Ours report every 10 seconds while the vehicle is moving, and less often while parked to conserve data and battery.
A tracker cannot be disabled by an outsider. Authorised users on your own account can send commands to the device, including engine immobilisation, and every such command is logged against the user who issued it.
Frequently asked
Short, direct answers to what people ask us about this topic.
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