Originally Posted by
njkayaker
He's apparently interested in differences of 1.4%. It's possible that the wheel sensor would be better generally than the GPS in practice. (I'm not going to say what the OP is interested in.)
The OP did state what he was interested in -- roughly .01 mile accuracy over distance of approximately 50 miles. GPS can do that, but measurements based on tire circumference would almost certainly not be capable of that.
On edit: oops, it wasn't the OP that stated the above requirements.
The wheel sensor also works better for instantaneous speed.
Yes, that's what they're designed to do. But, the OP is interested in distance -- that's not what speed sensors are designed to do.