'a) But as Field and Pearson point out the siting of some of the pits in the NE on the Cleal plan are out because Hawley got the co-ordinates wrong .'
With reference to 'Stonehenge Amesbury Survey Report' - Field and Pearson, I was not able to find any reference to Hawley's lack of decent co-ordinates. So at present I cannot reply Did not Field and Pearson produce an update diagram?