Alis is fitted with a multibeam echo sounder which is designed for high-resolution seabed mapping from shallow coastal waters to 1000 meters.

Multibeam echo sounder	EM1002
Manufacturer	Kongsberg
Frequency	95 kHz
Max depth	1000 m
Rx beams	111 equidistant
Beams resolution	2 x 2°
Swath width	150°