Hi folks, Think I may have uncovered a bug in Therion's parsing of the "calibrate tape" command. Survex: *calibrate tape 0 0.5 *calibrate tape 0 1 2 10 0 0 *calibrate tape 0 1 2 3 10 90 0 Therion: calibrate tape 0 0.5 calibrate tape 0 1 2 10 0 0 calibrate tape 0 1 2 3 10 90 0 In Survex, both legs are 10 m long. In Therion, the first leg is 5 m long and the second is 10 m long. Therion book: "The syntax is borrowed from Survex with minor modifications; the Survex manual may be useful as an additional reference for the user." Survex manual does not say what happens to the scale value when it is omitted, but it does say "By default, the zero error is 0.0 and the scale factor 1.0 for all quantities." This implies that the scale value should reset to 1 whenever it is omitted. Assuming Survex is "right" with this behaviour, does that mean Therion is wrong? Or is this one of those "minor differences"? Or if I just messed up, someone please shout at me ;) Cheers, Tarquin