Lidar stuff; There is a GPS mapper programme in the the new BA magazine, feed the measurements of stone circles into your GPS and then transfer by cable to programme on your computer which will give an approximate shape. The programme comes free at the moment from "astronomy.crysania.co.uk". Do not use GPS at moments of high international tension, apparently they (military) can scrabble them a bit, GPS have a built in component for such times. Moss (non technical but always wanted to own one of those things)

p.s.also interesting article on Carrowmore, arguing that the date on tomb 7 can be pushed back to 4320-3810bc...