The GP1870F features an internal antenna for ease of installation. It’s dual-range display allows you to view both short and long ranges of your chart simultaneously in a split-screen presentation. Furuno’s RotoKey interface allows for simple and stress-free operation. Turn the RotoKey for a finely stepped zoom control, or press the knob for full access to the GP1870F controls. The LCD screen allows for viewing from virtually any angle, even while wearing polarized sunglasses, plus the screen is bonded to ensure fogging-free operation.

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Unit is in very good condition working as new.

https://www.furunousa.com/en/products/gp1870f