Isamar left Bonifacio at about 1600 local time. The weather and sea conditions were ideal with calm seas and good visibility, and because of this the master decided not to switch on the radar. The master navigated by eye and monitored the vessel’s passage on an ECS1, which was set on a 6-mile scale. The vessel had no paper charts on board, and the master relied on the ECS to identify land masses and seabed topography. The ECS’s electronic charts had not been updated for nearly 10 years. Although the echo sounder was switched on, its shallow water alarm had not been set. (...) He then checked the vessel’s position on the ECS and noted that the display was on quite a large scale. By pushing the scale adjustment button four or five times, he reduced the scale to its minimum setting of 0.5 mile. At this scale, the ECS did show an area of shoal water not apparent on the larger scale. However, it did not display any depth soundings as shown on official hydrographic charts.