brkhorn13
While surveying the passage, the one on point tells the Azimuth and Heading (up or down and which direction) for the recorder. Then the other person on the other end confirms it by reading his/her instruments.
While surveying the passage, the one on point tells the Azimuth and Heading (up or down and which direction) for the recorder. Then the other person on the other end confirms it by reading his/her instruments.