(Repost) need Guidance...

So I've been doing a lot of research on what I need to make a toy car go from point A to B then have it repeat it,the only solution I found that could help me on this project were Encoders but I had to rule that solution out because Slippage and or being picked up would mess up the Route to point B. I want the toy car to remember a path Manually or remotely then have it repeat it Precisely. Are there any sensors I could use to remember a path then repeat it? I'm using Aruino UNO rev3

Please, don't open more than 1 thread for the same question. http://forum.arduino.cc/index.php?topic=233334.msg1680512#msg1680512