If you get stck for a GPS The RPRA accept Google earth coordinates and adjust as required .Not sure if the SU do though ? Download Google earth,zoom in to you loft ( Secretary or club official ) Mark with yellow marker,Lat and Long will show in box.Save as JPEG NOT PNG.(Smaller file) See photo. https://www.google.co.uk/intl/en_uk/earth/ https://www.rpra.org/wp-content/uploads/2021/02/Google-Earth-Procedure.pdf Hope this helps Lee