My ST4000+ control head has called it quits - the display is shot and the autopilot goes wherever it feels like. I think the cals are all off but the screen is so screwed up I can't see the menu. Wondering if I can replace the ST4000 head with the new 6000 head and if anyone has done this. The main thing I can see is the fluxgate compass compatability. I left a message on the Raymarine website - so far no answer - and checked the archives but didn't see anything pertaining to this problem. I have the MKII wheelpilot ready to install so this shouldn't be an issue. Any advice/experience welcomed.