Your iPhone does not use one location system. It blends several. That is helpful for convenience, but it also hides which source is actually giving you the answer.
GPS: The Satellite Layer
GPS listens to satellites and calculates position on-device. It is strongest outdoors, independent of cell service, and usually the most useful source when you need exact coordinates, altitude, and speed.
Cellular: The Coarse Fallback
Cell tower positioning estimates where you are based on nearby towers. It can be fast, but it is far less precise than satellite GPS and becomes useless when there is no cellular network to talk to.
Wi-Fi: Convenient but Context-Dependent
Wi-Fi positioning relies on known networks and databases built by Apple and others. It can work well in cities and homes, but it is not a universal positioning system. It fails exactly where many people need dependable location most: remote areas, flights, and dead zones.
Why The Difference Matters
- ▶If you think cellular location is GPS, you will overestimate what still works off-grid.
- ▶If you think a map app equals GPS, you will misread a blank map as a failed position.
- ▶If you ignore accuracy, you will trust bad fixes that only look polished.
The practical rule
For exact coordinates, altitude, speed, and in-flight use, the satellite layer is the one that matters most.
Where SkyLocation Sits In The Stack
SkyLocation is built around the data you still want when convenience layers fall away: exact GPS readout, live accuracy, and private location history. It is a utility first, not a map-first wrapper.
Use the location layer that still matters when signal gets messy.
