How GPS parking matching works in DropIn
Understand how DropIn uses phone GPS, parking pins, distance and timing to coordinate a nearby one-to-one car park handover.
Where the location comes from
DropIn does not need Google Maps to know your position. Modern phones calculate location from satellite navigation, nearby Wi-Fi, mobile networks and device sensors, then the browser provides the result after you grant permission.
The accuracy value can vary with buildings, trees, vehicle roofs, weather conditions and the phone itself. That is why DropIn asks the giver to confirm the pin rather than treating the first GPS point as a perfect parking bay.
How distance is calculated
The server compares latitude and longitude using a spherical-distance calculation. This gives a straight-line distance between the two GPS points and does not depend on a paid map provider.
Distance is one input, not a promise about driving time. One-way roads, traffic, car park layouts and access restrictions can make the real route longer.
How the parking pin works
For a giver, DropIn starts the handover near the phone location and allows a small pin correction to the actual bay. Large pin movements are rejected so a person cannot advertise a distant or fictional space.
For a finder, the app searches from the live phone location. The finder does not choose a landmark or type an address, which keeps the request tied to where they actually are.
What changes after acceptance
Before acceptance, DropIn uses location privately for matching but does not reveal the other person’s exact coordinates. After the giver accepts, both phones can update the live handover map and approximate arrival time.
Location sharing ends when the handover is completed, cancelled, interrupted or expired.
Questions about this guide
Does DropIn need a Google Maps API key for GPS?
No. Phone geolocation and distance calculations work without a Google Maps key. The visual map uses OpenStreetMap data.
Is the GPS position exact?
No phone GPS is perfect. DropIn checks accuracy and lets the giver make a small bay-level pin correction.
Why can the road distance be longer?
The base distance is between GPS points. Roads, one-way systems and car park entrances can create a longer driving route.