"Kongsberg (Simrad) SH90 fish finding sonar"@en . . "SDN:L22::TOOL1683" . "The Simrad SH90 is a 360 degree omnidirectional fish finding sonar with an operational range of 50 to 2000 metres, and a selectable frequency of 111.5 to 116.5 kHz. The instrument features software to reduce noise from interference on the colour display interface echo presentation. Both the horizontal and vertical beams are electronically stabilised for the vessel's roll and pitch movements, enabling the full circle sonar beam to stay on target independent of the vessel movements."@en . .