B&G Network Autopilot - Manual (Page 28)

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RAM DRIVE UNIT INSTALLATION
General consideration must be given to the steering system and its
geometry before starting the installation. Many factors must be
contemplated for a practical solution, the information given here is for
guidance only, although where a maximum or minimum value is given
this must be adhered to. It is essential that the unit is only installed in a
fully functional steering system, with no backlash or stiffness when
operating. Rectify any steering problems before installation of the ram
drive unit or the autopilot will not function correctly.