The instructions concerning the geographical objective became more specific: "The chief points of geographical interest are [...] to explore the ice barrier of Sir James Ross to its eastern extremity; to discover the land which was believed by Ross to flank the barrier to the eastward, or to ascertain that it does not exist [...] If you should decide to winter in the ice...your efforts as regards geographical exploration should be directed to [...] an advance to the western mountains, an advance to the south, and an exploration of the volcanic region".