Mounted a HDS 10 on bow of 2012 Eyra with Ram Mount. Didnt like Ram Mount on bow. Hard to get in and out of boat—trip hazard. Cover wont fit with unit mounted on Ram mount, sticks up to high. Hard to tighten and loosen hand knob to remove, not enough room to get hand down there. Took Ram Mount off and mounted HDS 10 in the well. Like it much better in well. Cover fits boat with unit mounted in well. Its tight on space but fits just fine. If you need to move it a smidge, file holes in gimball mount-not new holes in boat. Dont think a 12″ unit would fit in well.