Hello I have been forced to use a total station for some of the cave surveys I am doing due to the amount of metal/electricity in the cave. The total station records absolute angles, (in degrees and minutes) which therion does not process. So 320 should be interpreted as -40 therion: error -- Entrance.th [53] -- gradient reading out of range -- 321:49 however a quick check and survex does, but gives a warning, should Therion not also do this, it would save me having to do a tedious conversion. (Survex does not understand degrees and minutes but that is not really relevant) Example part of the file 1.0 1.1 1.56 - up 0 is steel pin in tarmac, first 4X marking #Tony's notes, azi and bearing swapped, but as this is the DistoX leg, it must be the corrected version #1.1 1.2 38.463 87:52 90:22 2 is Coxs Entrance #corrected version form DistoX [AA: April 13] 1.1 1.2 38.463 90.2 3 1.1 1.3 18.132 137:38 83:07 3 is Ladye Chapel Entrance & WIS fixed point 1.2 - 1.428 247:57 321:49 to top of arch 1.2 - 1.06 248:04 88:17 1.2 - 1.271 69:11 321:27 1.2 1.4 1.55 - down to nail in pavement 1.2 1.5 11.360 152:40 2:02 1.5 - 3.327 325:35 332:05 1.5 - 2.189 194:30 314:59 1.5 - 3.886 113:49 64:35 thanks Andrew