This is a commercial product and the FurunoUSA forum is only for recreational/light marine products. For commercial or deep sea products please contact your nearest authorized Furuno agent.
In the USA you can contact us at 360-834-9300 and ask for deep sea support or open a support case on our website.
If you are outside of the US please see this link. https://www.furuno.com/en/support/distributors/marine/