Okay, I'll try this here first before going anywhere else. Came with a used boat. Tried it once before removing it. Everything seems to work. Unit is 2 or 3 years old. Here are the specs on Raymarine website:
http://www.raymarine.com/raymarine/ProductDetail.asp?site=1&section=2&page=766&product_id=1698

msrp = $360. Includes transom-mount transducer and all cables, plus original owner's manual. Asking $200.00, including USPS Priority shipping.

--OJ