Mary from Wales, please include your email address in your correspondance. We have used GPS in mountainous environments, and most devices come with software for downloading into PC's. There is a fish database developed at Cornell called MUSE. Julian Humphreys, I think, was the creator. I don't have an email address for him, but MUSE might be useful to you. In general, as far as your genus/species in the same field question, my database experience has taught me to atomize atomize atomize. Put the smallest unit of information practicable in a single field. Eric Siegel [log in to unmask]