[Therion] data nosurvey

[Andrew Atkinson]

Hi all

I have 2 stations connected by sight only so I tried

data nosurvey from to
   2.1 2.9

full file attached, which works with the 2 lines above commented out, 
but with them in I get the error

therion: error -- unsurveyed shot between unfixed stations -- 
StalPotInlet.th [95]

Which is true, they are not fixed any help connecting these 2 stations 
with a centreline, to show line of sight would be useful

thanks

Andrew
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