Why a double relay?

The Shipcontroller remote control system features double relay switches. This is necessary, not for security reasons, but due to the need to manage more than two control positions. Thus, for the three possible up, down and neutral anchor windlass positions, two relays will be required, as each of them can control two positions only. Similarly, to switch between the bow, stern and neutral positions of the thrusters, two relays must be used

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