GPS Tracker FAQs

GPS works by measuring how long it takes radio signals to travel from multiple satellites to your receiver. Each satellite broadcasts its position and a precise timestamp; your device calculates the distance to at least four satellites and uses trilateration to pinpoint your location in three dimensions. The whole process happens in milliseconds and is accurate to within a few meters under clear skies.

Receiving GPS signals is completely free. The satellites are operated by the US government and broadcast openly to anyone with a compatible receiver. You may pay for the device itself, a data plan to transmit location data, or a subscription service that adds maps, alerts, or history, but the underlying satellite signal costs you nothing.

Yes, your device can calculate its position from satellite signals alone, with no internet required. However, without a data connection, it cannot download map tiles, send your location to another device, or trigger real-time alerts. Many dedicated GPS trackers store a log of positions offline and upload them in batches when a cell or Wi-Fi connection becomes available.

A GPS receiver can still determine its coordinates without a cellular signal, because the position fix comes from satellites, not cell towers. The limitation is transmission: if you want your location sent to a phone, server, or map in real time, the device needs some kind of radio link, whether cellular, satellite (like Iridium or Starlink), or Wi-Fi. Satellite communicators such as the Garmin inReach work entirely off-grid for this reason.

GPS is the satellite navigation system maintained by the US Air Force that provides positioning data. A GPS tracker is a physical device that receives that data and then transmits the location to another party, usually over a cellular network. Think of GPS as the underlying technology and a GPS tracker as a product built on top of it, similar to how Wi-Fi is a technology while a router is a product.

Consumer GPS receivers are typically accurate to 3-5 meters (10-16 feet) under open sky. Accuracy degrades near tall buildings, dense tree cover, or in tunnels due to signal multipath and blockage. Professional-grade RTK systems can achieve centimeter-level accuracy using correction data from ground stations, making them suitable for surveying and precision agriculture.

Most cellular GPS trackers include a SIM card and require a monthly or annual subscription to cover cellular data costs. The subscription fee pays for transmitting location data over the carrier network and often includes access to a tracking platform. Some trackers offer pay-as-you-go plans, others bundle the SIM into a flat annual fee. Offline or Bluetooth trackers like Apple AirTags do not need a SIM, but their range is limited accordingly.

Battery life varies enormously depending on update frequency, cellular technology, and battery size. A tracker pinging every 10 seconds might drain a small battery in a day or two, while one set to update every hour can last weeks or months. Hardwired vehicle trackers draw power from the car, so battery is not a concern. Always check the manufacturer's spec at your intended update interval, not just the headline figure.

Standard GPS struggles indoors because satellite signals are too weak to penetrate most building materials. Indoor positioning systems typically combine Wi-Fi triangulation, Bluetooth beacons, or ultra-wideband (UWB) radio to fill the gap. Some smartphones use a combination of all these signals alongside GPS for a "seamless" experience, but dedicated GPS-only devices will show little or no fix inside a building.

Tracking a vehicle or asset you own is generally legal in most countries. Tracking another person or a vehicle without their knowledge or consent is a different matter and is illegal in many jurisdictions, including most US states and EU member countries under GDPR. Fleet operators typically notify drivers in writing, and parents tracking minor children occupy a distinct legal and ethical category. When in doubt, consult a local legal professional, as laws vary significantly by location.