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Simrad SX90 Old Single computer

Note that the computer described on this page was made obsolete in August 2013.

This Processor Unit computer was put to use early 2009, and retired in 2013. The computer is still supported, but will not be used on new systems.


The Processor Unit serves several functions. It performs the advanced signal processing required to present the information on the display, and it allows you to control the sonar. It provides the graphic presentation of the sonar modes and the images created, it holds the menu system, it communicates with the Transceiver Unit, and reads information from the peripheral units.

The Processor Unit is a marine computer based on the Microsoft Windows XP® operating system. It is designed for rugged use, and placed on shock absorbers. The computer is based on a commercial design, but the software and hardware has been specified and assembled by Simrad to suit the sonar requirements. The computer holds a DVD player to be used for future software upgrades. It also provides several USB interface connectors.