Martin Ellis" <firstname.lastname@example.org
Mon, 13 Jan 2003 14:57:05 -0000
In the new BCRA Cave Surveying booklet by Anthony Day there has been a
change in the definition of a BCRA Grade 5 survey from that given in the old
cave surveying booklet.
The original definition was "Horizontal and vertical angles accurate to +/-
1 degree; Distances accurate to +/- 10 cm; Station position error less than
The new version is "Horizontal and vertical angles measured to +/- 1 degree;
Distances should be observed and recorded to the nearest centimetre and
station positions identified to less than 10 cm."
This is a significant change. BCRA Grade 5 is now considerably easier to
obtain as now you only have to be precise to +/- 1 degree, whilst previously
you had to be accurate to +/- 1 degree.
Is this "dumbing down" of BCRA Grade 5 a deliberate change by BCRA or is it
due to a misunderstanding of the original definition?