Echo Sounder · Navigation & Bridge Equipment
Simrad SU 90 is identified in the source list as a echo sounder. It is installed on the bridge and/or at the associated sensor location, with outputs distributed to other navigation equipment as required by the vessel. Its purpose is to provide the navigation measurement indicated by the equipment category for bridge use and connected systems. The source record provides the existing record note 'Navigation & Bridge Equipment'. Sensor principle, correction methods, interfaces and redundancy depend on the exact model and vessel installation. The exact model designation distinguishes sensing technology, display functions and interfaces from neighboring navigation instruments; refer to the approved manufacturer documentation for the exact figures.
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What our service work and the manufacturer documentation say about keeping this model running.
Compare the indicated value with independent references and investigate persistent disagreement rather than applying unrecorded corrections. Inspect sensors, antennas, transducers, cabling, power supplies, repeaters and network interfaces applicable to the installed equipment. Verify alarms and data outputs to radar, ECDIS, autopilot and voyage-data systems where connected. Keep calibration, deviation or configuration records current as appropriate to the sensor type. Protect exposed sensors and transducers from paint, deposits and water ingress. Refer to manufacturer and bridge-equipment documentation for exact test, calibration and alignment procedures.
Keep fuses, lamps or display consumables, selected power-supply and interface modules, cables or connectors and manufacturer-recommended sensor service parts. Replacement core sensors, antennas or processors must remain compatible with the approved bridge installation. Preserve calibration and configuration data when changing equipment.
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