On a pitch, LRUD data is useless. You should try to record NSEW data instead where possible. This must be clearly indicated in the notes. Try to draw a single continuous plan rather than one in six different bits as this is also hard to interpret when drawing up. In vertical sections, elevations take the place of plans and should be drawn in the same way.
Extended elevations are generally the most useful.
Cross sections without a scale, orientation or position are useless - this info should be noted on the plan. Cross-sections need not coincide with survey stations, but where they do not the distance to the nearest survey station should be noted. Calibration Calibration is very useful for detecting errors in instruments, people's eyesight and the local magnetic conditions. It can make a significant difference to accuracy. On expos, unless you have one or two very big caves it can be difficult to set something suitable up.