CONTENTS
of Compass Points 12
The journal of the BCRA Cave Surveying Group, June 1996
The Chelsea Surveying Ethos - John Stevens
Part one - discussion of techniques used
The Accuracy of GPS Receivers and an Attempt at
Do-It-Yourself Differential GPS - Bob Thrun
Does DIY differential GPS work, and how long do you
have to stand in one place to get good accuracy?