||Massive oceangoing ship, naval registry CVN-65, part of the American Navy in the American Navy in the 20th century on Erath. This warship
was a nuclear-powered aircraft carrier from which Starfleet officers Chekov and Uhura "borrowed" high-energy photons in order to recrystallize some dilithium so
that they could return to the 23rd century. During that covert operation, Chekov was captured by Navy personnel, but he eventually escaped. The Enterprise was docked at
the Alameda Naval Base at the time.
Star Trek IV: The Voyage Home
The aircraft carrier U.S.S. Ranger actually stood in for the Enterprise for filming during
Star Trek IV, since the real Enterprise was at sea at the time.
Star Trek Encyclopedia II