Trieste dove at/near 11°18.5′N 142°15.5′E﻿ / ﻿11.3083°N 142.2583°E﻿ / 11.3083; 142.2583, bottoming at 10,911 metres (35,797 ft) ±7 m (23 ft) into the Challenger Deep's western basin, as measured by an onboard manometer.[9] Another source states the measured depth at the bottom was measured with a manometer at 10,913 m (35,804 ft) ±5 m (16 ft).[10][11] Navigation of the support ships was by celestial and LORAN-C with an accuracy of 460 metres (1,510 ft) or less.[12] Fisher noted that the Trieste's reported depth "agrees well with the sonic sounding."[13]