Russell Wyeth and I received a grant from the National Geographic Society's Committee for Research and Exploration to test some hypotheses about how the sea slug Tritonia diomedea uses the earth's magnetic field to navigate. We are now packing up our dive gear and lab equipment for the trip to Tofino, British Columbia, where we will board the dive boat that will be our home for three weeks.  I'm leaving from my campus in Hayward, California, and Russell is starting in Antigonish, Nova Scotia.  I was last at this field site in 1992.