grade BCRA3 -title "BCRA grade 3"
  
  # 95.44% of readings are within 0.5m (2 S.D.)
  length 0.25 metres

  # 95.44% of readings are within 2.5 degrees (2 S.D.)
  bearing 1.25 degrees

  # 95.44% of readings are within 2.5 degrees (2 S.D.)
  gradient 1.25 degrees

  # 95.44% of positions are within 0.5m (2 S.D.)
  position 0.25 metres

endgrade


grade BCRA5 -title "BCRA grade 5"

  # 95.44% of readings are within 0.1m (2 S.D.)
  length 0.05 metres

  # 95.44% of readings are within 1 degree (2 S.D.)
  bearing 0.5 degrees

  # 95.44% of readings are within 1 degree (2 S.D.)
  gradient 0.5 degrees

  # 95.44% of positions are within 0.1m (2 S.D.)
  position 0.05 metres
  
endgrade