USA-585 (also known as GPS III-10, NAVSTAR 86 and Hedy Lamarr), is a United States navigation satellite which forms part of the Global Positioning System. It was launched by Falcon 9 on 21 April 2026. It is the 10th and final satellite in the GPS III series.

Satellite

Artist's rendering of GPS-III satellite in orbit

The satellite was named in 2021 after Hedy Lamarr, the inventor of the frequency-hopping technology. Construction of the satellite was completed in February 2023. The satellite includes a Tesat-Spacecom SCOT80 optical communications terminal, intended to perform the first laser communications test from a GPS satellite at medium Earth orbit.

Launch

The satellite's launch was originally awarded to SpaceX but it was later switched to ULA for a mission exchange to launch GPS III-07 Sally Ride on Falcon 9 and later in March 2026 it was reassigned to SpaceX because of delays due to recent Vulcan solid rocket booster issues during the launch of the USSF-87 mission. In exchange, ULA was awarded with USSF-70 mission originally planned for launch on Falcon Heavy. The launch mission was named GPS III-8.