Limpet city.

This boulder has been home to limpets (Patella sp) for a long time judging by the many deep scars. The rock is completely seaweed free: the limpets probably graze down any seaweed that grow on its surface. I'd like to know how secure a home this is: I'm going to take my GPS down and fix its position to find out if the winter storms move up around the beach. I'm also going to take my hand-bearing compass for a second fix. I've been a sailor long enough to have seen some very whimsical positions come from GPS machines.