Grade 1- A sketch of low accuracy where no measurements have been madeGrade 2- May be used, if necessary, to describe a sk...
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British cave research ass. gradings

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British cave research ass. gradings

  1. 1. Grade 1- A sketch of low accuracy where no measurements have been madeGrade 2- May be used, if necessary, to describe a sketch that is intermidiate between g1 & g3Grade 3- A rough magnetic survey. Horizontal and vertical angles measured to +/- 2.5 degrees;distances measured to +/- 50 cm; station position error less than +/- 50 cmGrade 4- May be used, if necessary, to describe a survey that fails to attain all of therequirements of g5 but is more accurate than g3Grade 5- A magnetic survey, horizontal and vertical angles accurate to +/- 1 degree; distancesaccurate to +/- 10cm; station position error less than +/- 10cmGrade 6- A magnetic survey that is more accurate than g5Grade X- A survey that is based primarily on the use of a theodolite instead of acompass Classification of survey detail:Class A- All details based on memoryClass B- Passage details estimated and recorded in the caveClass C- Measurements of details made at survey stations onlyClass D- Measurements of detail made at survey stations and whenever necessary betweenstations to show significant changes in passage shape, size, direction etc... Recomended grading/classification combinations Grade 1A Grade 3B or 3C Grade 5C or 5D Grade 6D Grade XB, XC, or XD

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