This is labeled as a D256 ST80 Masthead Cable. It is 50 meters long. One end is a 3-Pin Female End similar to the ST50 style round Seatalk connectors but with no locking collar and the other end is a flat 3-pin Seatalk connector. We believe this may be used with the Autohelm Z219 active wind transducer but frankly have never seen this cable before. What we can confidently say is:

IT WILL NOT CONNECT TO ANY 5-PIN ANALOG RAYMARINE/AUTOHELM/RAYTHEON MASTHEAD. 

Please ensure compatibility before purchasing.

Thanks for looking

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All items sold at Max Marine Electronics come as you see in the pictures provided, with only the parts and accessories stated in the description section named “What’s Included”. IF YOU DO NOT SEE SOMETHING YOU EXPECT TO BE INCLUDED IN THE DESCRIPTION WE PROVIDE, IT WILL NOT BE INCLUDED. Read all descriptions thoroughly. There are times a display is used only to show the item being sold is functional and working properly. In this case, these displays are not included. If you have any questions feel free to send a message or call Max Marine Electronics Inc, Pompano Beach, Florida. We always want to be transparent with our customers and fully disclose any information regarding the products we sell.