CONTENTS
of Compass Points 2
The journal of the BCRA Cave Surveying Group, December 1993

Welcome

Editorial and news

Letters

Instrument Corner

• Suunto Illumination -Daniel H Gebauer, Schwäbisch Gmund

  Easy Suunto lighting technique

• Suunto Repairs -Greg Springer/Wookey

• Magnetic effects of objects on Compass -Tom Moss

  Tests on deviationscaused by various magnetic objects

• The TWIN -Kevin Harris

  A review of the new 'Twin' combined compass/clino.

Magnetic Field Variations -Vic Schmidt.

Some words from an expert on the possible errors caused by fluctuations in the earth's magnetic field.

HTO survey data interchange format -Doug Dotson/Wookey

Hierarchical Tagged Objects - A proposed survey data description language for the interchange and archiving of survey data.