Happy New Year! I've just tried to equate some fixed stations that have been defined a bit like this; fix 809 2502023 6021519 594 4 4 12 but I get errors from therion like this; error -- equate of two fixed stations -- 809@NSpots.NgaruaArea and A1@a.Kairuru.NgaruaArea These represent gps fixes taken at the same place on various occasions and part of various overland surveys. At first look it seems like this might be a desired response from Therion. How can two stations with specified and differing co-ordinates be 'equal'? My assumption was that the standard errors give the actual position of the station a degree of uncertainty or 'fuzzyness', and that by equating two such stations they would be 'averaged out' in a similar way to loop closures or two fixed stations connected by a survey network. But it seems I might have assumed wrong. Is it part of therions design to allow equating a number of fixed stations? By using alternative syntax or connecting the stations with a dummy survey leg with large std error perhaps? Bruce