I've built a couple mini-itx systems for boats, and 12vdc monitors are getting harder to come by. I currently have a Samsung SyncMaster 150MP that is a fair monitor and a TV (with tuner) with four inputs. I also have Scanport 715a, but I doubt you'll ever find one, even on Ebay My Garmin Chartplotter
looks good on the Samsung. Neither of these will be readable in daylight, much less sunlight.