Despite blustery conditions we met up with Pembrokeshire College Lecturer, Powell Strong and some of his students to try out some survey methodology. Conditions were far from ideal but the porp's did show.
So we spit our group in two for the counts and with porpoises showing randomly had two very similar click counts. The first of 17 and 16 sightings over a five minute period. A second count produces 2 and 3 sightings lower numbers perhaps as the porpoises were moving through. I think that is a strong indication of the accuracy of our methodology not perfect but reasonably reliable.