While looking for a higher accuracy GPS for cycling I ran across the Push 1.0 Supernova. (http://www.pushthelim.it )  The device looks promising, it has a great feature set in a small form factor.  With 10Hz GPS it will be much more accurate when riding at high speeds, such as car and motorcycle road racing.  Also the high GPS refresh rate will be great where your path is very winding, as the additional data points will allow you to smooth the arc of turns and give a much better picture of your data.    Check them out and don’t forget to Vote for them in Engadget’s Insertcoin contest. http://insertcoin.engadget.com/