Choose your city and the five daily prayers, plus the qibla bearing, are computed locally — nothing about your location is sent anywhere.
Times here use the Muslim World League convention for the Fajr and Isha angles, the most widely used default. Seven methods exist because scholars differ on how far below the horizon the sun must sit at true dawn and full dusk — a fuller explainer, with a method switcher, is coming to this page.
Travelling? See airport prayer rooms at major hubs.