Because drilling near Guam was not envisioned as part of the Leg 191 plan, no maps of the drill site were on board the JOIDES Resolution. During the cruise, we had only the position of the backarc volcano and its summit depth. Consequently, a short survey of the volcano summit was conducted by the JOIDES Resolution from 0940 to 1355 hr (UTC) on 5 September using the 3.5- and 12.0-kHz echo sounders and magnetometer (Fig. F4). The volcano was found to have flank slopes of ~5° and a relatively flat summit at a depth of about 2874 m (Fig. F5). Site 1182 was chosen to be in the middle of the summit platform (Fig. F4).