Lodestar Hardware
Manual
Document Ref: UM-8084-
Issue: A– Rev
© Sonardyne International Limited 201
5 Installation
5.1 Introduction
The performance specification listed in section 4.5 for the Lodestar Attitude and
Heading Reference System is valid for the Lodestar’s body frame. For Lodestar’s
measurements to be valid for the vessel on which it is mounted, it is very important
to install Lodestar correctly as detailed in this chapter.
Any misalignment between the Lodestar’s IMU body frame and
the vessel’s body frame will mean that angles of heading, roll
and pitch reported by Lodestar will be accurate for the Lodestar,
but will NOT be accurate for the vessel.
This chapter explains how to install the Lodestar correctly so that its
measurements are valid for the vessel. It explains all
connections required, and provides information to help use Lodestar with multiple
data receiving units.
5.2 Unpacking and inspection
The Lodestar AHRS includes a number of delicate and sensitive electronic
components. In particular, the accelerometers and Ring Laser Gyroscopes (RLGs)
that form the Inertial Measurement Unit (IMU) are sensitive to shock and vibration.
If damaged, these components cannot be replaced in the field, and the complete
Lodestar unit must be returned to the factory for repair and recalibration.
Always handle the Lodestar with care. Store the unit in the
shipping container until it is ready to be installed in the prepared
Inspect the Lodestar and all the supplied parts on receipt, and check the shipment
includes all the items listed on the shipping documents.
immediately if there are any parts missing, or if any of the supplied parts show
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