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. Unlike most other ensigns, who are normally portrayed as recent Starfleet Academy graduates in their early 20s, this character appears to be in her late 30s or early 40s.

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
ISS Enterprise:	Chekov
USS Enterprise (NCC-1701) alternate reality:	Chekov