Please, no wretched electronic systems. Use common sense and mirrors. A one convex mirror so you can see the whole plane for starting, push-backs, general handling and so forth and a flat mirror so you can see the nosewheel and stop line for docking. No electrics are need, no calibration program etc. and you will reduce the liability for foul-ups. You won't need any staff training (because it is effectively pilot operated) and we get the information we need to park. The only maintenance required is a an occasional wash by the window cleaner. I reckon mirrors would be cheaper to install and run than ANY electronic system and will also be considerably more reliable.
PM