I bought this http://www.iboats.com/Vexilar_Edge2...4908704--**********.389828795--view_id.170150 to replace a new x510c I did not like.
The Vexilar is not cheap, but if your going to drill a hole in a boat the Vexilar is worth it.
I had a Lowrance X75 for 7 years. Flawless graph. The new Lowrance graphs in my opinion aren`t anywhere near as good as their older units.
$474.00 for a graph that doesn`t work right is crazy. Thats what I got with the Lowrance X510c. The vexilar is a great unit.That's crazy!