Of how many satellites does the space segment of a NAVSTAR/GPS system consist in the notional constellation?

The notional constellation of the NAVSTAR/GPS system consists of a minimum of 24 satellites, which is designed to ensure global coverage for users on Earth. This configuration allows for optimal positioning capabilities, as having multiple satellites in view is essential for accurate triangulation of a user's position.

The 24 satellites provide redundancy and ensure that at least four satellites are visible from almost any point on the planet at any time, which is necessary for determining a precise three-dimensional position (latitude, longitude, and altitude) as well as accurate time data.

Over time, the system has included more satellites beyond the operational minimum of 24 to enhance accuracy, reliability, and availability of the service. As of now, the total number of satellites in orbit can exceed this number, but the foundational requirement established for global positioning was set at 24 for effective navigation capabilities.