Raymarine Autopilot S1000 - Manual (Page 39)

User Guide 39
Connections to other equipment
If your Raymarine equipment is to be connected to other equipment using a
cable not supplied by Raymarine, a suppression ferrite MUST always be
attached to the cable near to the Raymarine unit.
Handbook Information
To the best of our knowledge, the information in this handbook was correct
when it went to press. However, Raymarine cannot accept liability for any
inaccuracies or omissions it may contain. In addition, our policy of
continuous product improvement may change specifications without
notice. As a result, Raymarine cannot accept liability for any differences
between the product and the handbook.