May I add this to the wish list. every few years I get data in a land survey format, which often does not use a magnetic survey but a turned through angle (does it have a proper name?) I guess it is not that easy, otherwise this sort of think usually gets done. Readings from two stations look something like this. OBSERVATIONS ------------ LOCATION : Wookey JOB NO : 164 DATE SURVEYED: 19 MAY 2015 16: FILE : TI16401 SURVEYOR : D Factors: EDITED STN : 1 H.I. 1.410 PNT HA VA SDIST TGT CODE DIMS REMARKS 1 0.0000 90.1539 59.621 1.510 SS00000N ~ #SS 2# 2 217.5531 73.4609 16.824 1.655 SS00000N ~ #SS 3# 3 359.5958 90.1545 59.621 1.510 SS00000N ~ #SS 2# 4 217.5524 73.4617 16.825 1.655 SL00000A ~ ~ 5 359.5959 90.1538 59.621 1.510 SS00000N ~ #SS 2# OBSERVATIONS ------------ LOCATION : Wookey JOB NO : 164 DATE SURVEYED: 26 MAY 2015 20: FILE : TI16403 SURVEYOR : D Factors: EDITED STN : 2 H.I. 1.420 PNT HA VA SDIST TGT CODE DIMS REMARKS 12 0.0000 94.1903 14.233 1.400 SS00000N ~ #SS 2A# 13 355.2701 89.3842 59.615 1.420 SS00000N ~ #SS 1# 14 0.0004 94.1754 14.233 1.420 SS00000N ~ #SS 2A# I think this is how they come out of the machine, but cannot be certain. So the first set of observations are all from station 1 (well technically 1.410 above station) so the first line of that set is a reading to ss 2 or station 2, which has been set at 0 and ss 3 is 217 degrees from that reading (No relation to North.) Obviously this type of data cannot be used without 2 statoins of know possition somewhere on the traverse. We have 2 ends of magnetic survey to connect this survey too. Anyway it would be great to get this data into therion/survex, the tunnellers of Wookey really need it, 15m in and they are not sure what direction to go..... Slight formating problem that might also be nice to solve, although it is messy, and not to be encouraged is that 217.5531 means 217 degrees, 55 munites 31 seconds thanks Andrew