Is the gps locator useful in the basement?

It's useless, because high-rise buildings, secret rooms and basements will block satellites, so satellite information will be lost.

The GPS locator is a terminal with a built-in GPS module and a mobile communication module, which is used to transmit the positioning data obtained by the GPS module to a server on the Internet through the mobile communication module, so that the location of the terminal can be inquired on a computer or a mobile phone.

Principle: The spatial distribution of GPS consists of 24 working GPS satellites, which together form a constellation of GPS satellites, of which 2 1 is a navigation satellite and 3 are active backup satellites. These 24 satellites are distributed in six orbits around the earth with an inclination of 55. The operating period of the satellite is about 12 sidereal time. Every GPS working satellite will send out navigation and positioning signals. GPS users use these signals to work.