Hi, We are facing a problem with Therion and fixed points obtained by radiolocation. This is the survey of a very long siphon taken with the SeaCraft ENC3 tool. There are many many stations saved automatically with the device. We fixed two points determined by radiolocation, one at the beginning of the siphon and another at the end. When after Therion compilatione, the survey is completely distorted. Doesn't the problem come from too many shots and Therion not being able to compensate for the very small shots? Have you encountered this problem before? Thanks for your help, -- Daniel Chailloux. _____________ Daniel Chailloux 17, avenue Gabrielle d’Estrées 91830 Le Coudray-Montceaux - France Mobile : +33 6 8290 7375 Email : danielchailloux@orange.fr