Raymarine ST3000 Owner's Handbook Manual page 41

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EMC suppression ferrites
We supply the fluxgate compass and power cables with suppression
ferrites fitted. Always use these ferrites supplied by Raymarine.
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.
ST3000 Wheel Drive Autopilot - Owner's Handbook
The equipment is supplied from a separate battery from that used
for engine start. Voltage drops below 10 V, and starter motor
transients, can cause the equipment to reset. This will not damage
the equipment, but may cause the loss of some information and
may change the operating mode.
Raymarine specified cables are used. Cutting and rejoining these
cables can compromise EMC performance and must be avoided
unless doing so is detailed in the installation manual.
If a suppression ferrite is attached to a cable, this ferrite should not
be removed. If the ferrite needs to be removed during installation
it must be reassembled in the same position.
D3548-2