This is a trivial matter, but may be worth some discussion and perhaps adjusting Therions behaviour sometime. I have been moving 'data nosurvey' entries from the main survey centreline into their own centrelines, so that, presumably (when I learn to use sql) users will be able to interrogate the database and uniquely identify each unsurveyed connection, when it was made and who 'explored' it. (The metadata gets distributed across the whole centreline if these are all put in the same centreline). The relevant data fields would seem to be 'explo-date' and 'explo-team' and 'date' would seem to be irrelevant, as 'date' is the survey date, and these short passages have by definition not been surveyed. If however, the overall survey has a coordinate system set, and the particular centreline has a 'data <xxx>' block set as well, then Therion will helpfully display a warning message; "warning -- unable to determine magnetic declination for undated surveys" It would seem to me that 'data nosurvey' is a special case that should not trigger this warning. An example of how I am entering these in my overall cave survey file below. Regards Bruce #Unsurveyed Connections #================== centreline explo-date 2011.05.28 explo-team "This Caver" explo-team "That Caver" explo-team "Bruce Mutton" #date 2011.05.28 #date needed to suppress 'undated survey declination' error data nosurvey from to jg8.10@jg ij3.44@ij #unsurveyed connection Train to Carpe Diem ig2.60@ig IK10.21@ik #unsurveyed connection What Sump Lucky Cowboy endcentreline centreline explo-date 2012.03.24 explo-team "This Caver" explo-team "That Caver" #date 2012.03.24 #date needed to suppress 'undated survey declination' error data nosurvey from to kb51.33@kb2 ka50.4@ka2 #unsurveyed connection in KA-KB-Conscious endcentreline