Departing Efate on 13 November, she took up her position as listening vessel at the lagoon entrance off Betio early on the morning of the 20th. While pre-invasion bombardment was in progress, she and swept a channel from the transport area into the lagoon. Just prior to the landings, she took up duties as assistant control and survey ship and began marking the channel and searching out possible anchorages in the lagoon. On the 21st, she returned to the transport area and resumed screening duties.