We had a very informative course on 'Theory of Geophysical Survey' by Peter Masters of Cranfield University last night, which uncovered some of the mysteries of geophysical survey. We learnt the basics of how magnetometry and resistivity work, and learnt how to interpret some of the results. We hope it will prove useful to groups, particularly as many people will be trained in resistivity and magnetometry and how to process data using Snuffler this summer, and will be conducting their own projects using Jigsaw equipment.