Raymarine Raydata Installation And Operating Handbook page 74

Chapter 7: Problem Solving 65
Should any difficulties arise, please consult Raymarine's Product
Support department in the U.K. or U.S.A., or your own National
Distributor, who will be able to provide expert assistance. If a problem
arises that cannot be resolved, you should remove the RayData from its
mounting, unplug the cabling, and return the unit to your dealer.
Always quote the serial number when returning a unit for
servicing. This is shown on the product label on the rear of the
RayData.