
1) Sea satellite
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https://www.crosswordclues.com/clue/seasat

Seasat was the first Earth-orbiting satellite designed for remote sensing of the Earth`s oceans and had on board the first spaceborne synthetic aperture radar (SAR). The mission was designed to demonstrate the feasibility of global satellite monitoring of oceanographic phenomena and to help determine the requirements for an operational ocean remo....
Found on
http://en.wikipedia.org/wiki/Seasat

experimental U.S. ocean surveillance satellite launched June 27, 1978. During its 99 days of operation, Seasat orbited the Earth 14 times daily and ... [2 related articles]
Found on
http://www.britannica.com/eb/a-z/s/53

A NASA/JPL (Jet Propulsion Laboratory) satellite that carried out the first remote sensing of Earth`s oceans using synthetic aperture radar (SAR). The mission ended on Oct. 10, 1978, due to a failure of the vehicle`s electric power system. Although only about 42 hours of real-time data was received,...
Found on
http://www.daviddarling.info/encyclopedia/S/Seasat.html

acronym: sea satellite (an oceanographic research satellite) (NASA)
Found on
https://www.encyclo.co.uk/local/20002
No exact match found.