Hi, I'm a little bit confused at the moment how to correct for declination and meridian convergence. Question 1: Is it correct that in therion and in survex the declination is specified exactly the opposite way? Therion handbook page 18: true bearing = measured bearing + declination Survex 1.2.1 manual page 19: (true bearing)=((bearing)-(declination zero err)) So in case that magnetic north is 2° east of geographic north, I have to correct this in therion by -2 and in survex by +2. If this is correct, could you please add a warning note to the therion manual! Question 2: When I enter the measurement data in therion, the meridian convergence is handled automatically (in case a "cs" is specified). However due to historic reasons most of our data is still in survex format. I import the ".3d" file and specify the "cs" during import. I assume that therion is not applying any corrections for the meridian convergence and I need to correct the bearings manually in survex?