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Simrad ST90
Speed log requirement
In order to operate correctly, the ST90 system requires input from a speed log. Unless
specified in the contract, a speed log is not a part of the ST90 system delivery. Provided
that a speed log sensor is interfaced to the ST90 system, the vessel's current speed can be
presented in the user interface.
Note
Without speed information, the ST90 system will neither be able to present correct
navigational information, nor compensate for vessel movements. This lack of
compensation will prevent the system from providing correct echo information.
In most cases a suitable sensor is already installed on the vessel. A global positioning
system (GPS) with a compatible output format can also be used.
Course gyro requirement
In order to operate correctly, the ST90 system requires input from a course gyro. A
course gyro is not a part of the ST90 delivery. When a course gyro is connected to the
ST90, the vessel's current heading can be presented in the user interface.
Without the input from a course gyro, the ST90 system will not be able to present correct
navigational information. In most cases a suitable course gyro is already installed on
the vessel.
Note
Most global positioning system (GPS) can provide course information, but this data is
generally too inconsistent to provide a stable presentation on the ST90 system. This
inconsistency is especially noticeable at low vessel speeds. Incorrect course information
can then result in settings not working properly.
We recommend that you use a satellite compass or a gyro compass.
Uninterruptible power supply (UPS) requirement
It is important to ensure continuous operation of the ST90 system independent of any
varying quality of the vessel's mains supply. The use of uninterruptible power supplies
(UPS) is therefore required.
Uninterruptible power supply units are not included in the standard ST90 system
delivery. These items must be purchased locally. Several commercial types are available.
Note
Make sure that the Uninterruptible Power Supply (UPS) does not generate switching
noise in the same frequency band as the ST90 system.
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110-0035138/A
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