The Noise App captures GPS coordinates each time a user creates a new

report. The app will request permission to capture a GPS location as soon as the record button is pressed. Once the location has been captured, the app will stop taking any further readings for the current report.

The app will determine accuracy by two factors:

• How recent the GPS location timestamp is (as reported by iOS and Android)

• The radius position accuracy GPS parameter in metres (as reported by iOS and Android)

There will be situations where the timestamp is accurate, but the position

accuracy is showing a large radius. This can occur when there are insufficient reference points to collect accurate coordinates from, for example:

• Poor WIFI

• A low-quality GPS chipset in device

• Poor mobile coverage

• Poor signal to a satellite (e.g. sky blockage or atmospheric conditions)

GPS accuracy is usually to within an 8-metre radius in outdoor conditions.

Given that many of our users will be indoors at the time of submission, it is

unlikely that devices will produce these figures for each report.