Sorry I was throwing too much in together there - the data I gave was for centre-circle to quartz boulder to horizon, rather than the axial line and like I said - could be way off. It (quartz-line) looks to direct to the four-stone setting at Maulatanvally and that's where I took the reading.

Jon Patrick's survey was done as a check on John Barber's earlier data and he came up with a dec. of -24.3 for the main axis-line (to a saddle between two hills opposite the site). Clive Ruggles only surveyed the multiple stone circles, but still it is odd that he doesn't mention it, given his mentioning Drombeg as the only example. I'll get the exact reference in a sec.