Question

gps - the most precise navigation system ever invented. the global positioning system (gps) is a network of about 30 satellites orbiting the earth at an altitude of 20,000 km. the system was originally developed by the us government for military navigation but now anyone with a gps device, be it a satnav, mobile phone or handheld gps unit, can receive the radio signals that the satellites broadcast. - text from www.physics.org. according to the passage, which of the following best summarizes the usefulness of gps technology? gps technology can show exact positions on the earth, but is significantly limited by the location of the 30 satellites and personal receiver. gps can be used by anyone in the world who has access to wireless internet or advanced radio technology. gps technology has been in use since the mid 1900s. gps satellites orbit 20,000 kms above the earths surface and was created for military use.

Explanation:

The passage emphasizes that GPS technology can show exact positions on Earth, and this is its main usefulness. The other options either talk about its origin, usage conditions or orbital details rather than its core functionality of providing location - related information.

Answer:

GPS technology can show exact positions on the Earth.