She assumed both positions 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"). While the Enterprise crew was looking for any phenomenon that could help explain how and why the landing party went missing, Haines (working at the science station on the bridge) noticed and reported a barely detectable but consistent fluctuating energy reading in a distant hydrogen cloud. The Enterprise computers were able to identify the reading as an ionization trail, and Spock, acting as ship's captain in the absence of James T. Kirk, theorized that the trail might lead to the missing landing party. The Enterprise was able to follow the trail to Triskelion, with Haines acting as navigator.
|Navigators of the starships Enterprise|
|USS Enterprise:||Arex • Bailey • Brent • Chekov • DePaul • DeSalle • DiFalco • Farrell • Hadley • Haines • Ilia • Kelso • Latimer • Leslie • Osborne • Painter • Riley • Stiles • Saavik • Tyler • Uhura|
|USS Enterprise (alternate reality):||Chekov • Darwin|