The error correcting module 304 corrects the error in the measured speed by subtracting {HEAD ~ the correction value} from {TAIL ~ the error} 
from
The error correcting module 304 corrects the error in the measured speed by subtracting { HEAD ~ the correction value } from { TAIL ~ the error }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL