 The small size of the ships limited their ability at sea (deployable in conditions up to Sea State 3, but recommended to seek shelter in Sea State 4 or above), and prohibited regular deployment outside the Sydney-Newcastle-Jervis Bay area.The 1991 Force Structure Review recommended no further ships be built, and that the two catamarans be restricted to training and operations in confined waters.Instead, the RAN focused on acquiring four to six coastal minesweepers (the "Huon"-class), and maintaining the MSAs as an as-needed inshore mine-warfare force.