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- How is triangulation used to locate a caller?
- What’s the newest way to share your location in an emergency?
In an emergency, one of the most important pieces of information first responders need is your location. This is where 911 and 112 come in. Both services use a process called triangulation to locate a caller in an emergency. This article details how 911 and its European 112 counterpart can triangulate a call and determine your location without you providing it.
Background
When 911 was first introduced, the system was limited because callers had to manually provide their location and phone number to emergency services. This information was often inaccurate and resulted in delays in emergency response times, especially when callers failed to provide an accurate location.
To address this concern, an improved system called Enhanced 911 (E911) was developed. Under E911, telecommunications providers are required to provide emergency services with more detailed information whenever a 911 call is made. This includes the caller’s phone number and identifying information, as well as location information that can be determined via GPS and other technologies. To obtain the caller’s location, emergency responders rely on a technique known as triangulation.
What is triangulation?
Triangulation is the process of using three or more points to find the location of an object. When locating phones, this technique measures the distance between two cell phone towers and the angle of the phone signal from each tower. This information is further processed to calculate the phone’s location.
This is how most phones, whether modern smartphones or legacy T9 phones, determine their location when connecting to a network. Network operators can use this information to provide localized services such as local weather forecasts or targeted advertising. But how do emergency services use this method?
How is triangulation used to locate a caller?
When a person calls 119 or 112, the call is routed to a local emergency service center, also known as a Public Safety Answering Point (PSAP). PSAP operators usually ask the caller for their location. However, in some cases, the caller may not be able to provide this information. Triangulation can help here.
To triangulate the caller’s location, the PSAP operator uses the signal strength of the caller’s mobile phone to estimate the caller’s location. By measuring the strength of the signal at each tower, operators can determine the distance between the caller and each tower. Once the distance is calculated, the operator can use triangulation to locate the caller.
The accuracy of the triangulation process depends on many factors, including the number of cell towers in the area, signal strength, interference, tower density, and caller location. In some cases, the caller’s location can be determined with an accuracy of a few meters, in others it is less accurate.
To improve the accuracy of your cell phone’s location, emergency services also use GPS, if available on your device. For this reason, it’s important to make sure your phone’s GPS is on when calling 119 or 112.
What’s the newest way to share your location in an emergency?
To overcome some of the limitations of network-based and GPS-based location methods, some modern smartphones have developed new ways to share location in emergencies. For example, most modern Android smartphones have a feature called Emergency Location Service (ELS).
ELS uses data from Wi-Fi access points, Bluetooth beacons, cell towers, and GPS signals together to better estimate your location. When you dial an emergency number on your ELS-enabled Android device, the device sends the best available location directly to emergency services over a secure channel.
According to Google, when an Android device uses ELS to send location information, the process is different than sharing location information with Google Maps. Please also note that ELS can automatically enable device location and Google Location Services on your Android device whenever an emergency services number is called. even if these settings are turned off by the user. This is done solely to calculate emergency locations for emergency response providers. After the emergency call ends, the user’s phone location settings are restored to their original state.
Similarly, the Apple iPhone has a feature called Emergency SOS. When you use Emergency SOS on iOS, your iPhone sends your current location data and medical information you’ve stored in the Health app. You can also choose to share your location updates for a period of time after you make an emergency call.
Overall, the ability of 911 and 112 to locate callers in an emergency is very important to save lives. Traditional triangulation techniques that use cell towers to locate callers may not be efficient, but when used in conjunction with other location-based techniques, they can improve the accuracy and speed of emergency response. significantly improved.
Finally, keep your phone’s location services turned on so emergency services can quickly and accurately locate you when you need them.
