Jana Haines

From Memory Alpha, the free Star Trek reference.

Jana Haines was a 23rd century Human Starfleet ensign. She was assigned to the USS Enterprise, and served as a relief navigator and science officer during Pavel Chekov's absence when a landing party to Gamma II on stardate 3211 went missing, captured by the Providers of Triskelion. (TOS: "The Gamesters of Triskelion")

Haines was played by Victoria George. Her apparent age suggests that she might be a prior enlisted Starfleet member rather than a newly commissioned Ensign from Starfleet Academy.

Navigators of the starships Enterprise
USS Enterprise (NCC-1701):	Tyler • Kelso • Bailey • Farrell • Hadley • Riley • Stiles • Latimer • DeSalle • Osborne • Painter • Chekov • Leslie • Haines • Arex • Ilia • DiFalco • Saavik
USS Enterprise-A:	Chekov