Re: GPS?
the US GPS system used to be known as NAVSTAR GPS. Some people still call it NAVSTAR.
GPS is a pretty pretty generic name, GNSS is a messy workaround for someone asserting IP rights on a generic name shortening of a longer one that should have been tossed out (the USA spent quite a long time building the NAVSTAR name, but media called it GPS and the name stuck)
GPS is as generic as "tissue" or "vacuum cleaner". NAVSTAR is not.