I have for sale, a Lowrance LCX-17M (7" screen). I have used this unit on the bow of my boat for the past couple of years with no issues whatsoever. The screen is flawless and all buttons and menus work perfectly.
This setup includes:
LCX-17M head unit
Lowrance face cover
Gimball bracket and knobs
Transducer Shield and Saver
This unit is GPS capable but I never used GPS up front so I do not have a puck for it.
Asking $150 OBO
This link will take you to pictures of the unit --> LCX-17M