I bought this anticipating needing it but the noise filter on my new 859 works great. If anyone needs it I will sell it for $55 plus shipping. I paid $65 plus shipping. I'm willing to listen to all trades as well. I need two covers for my 800 series units since I'm an idiot and left them on while going to the lake. I would also trade toward a precision gps antenna.

Thanks

Adam Beasley