Hi John, sorry for the late answer. We use following proj4 EPSG:3908 definition in therion: # MGI 1901 / Balkans zone 6 <3908> +proj=tmerc +lat_0=0 +lon_0=18 +k=0.9999 +x_0=6500000 +y_0=0 +ellps=bessel +units=m +no_defs <> It is extracted from proj4 library. If this is not correct (it looks, some coeficients are missing), you may define your own CS in therion.ini, if you will be able to construct correct proj4 projection definition. Unfortunatelly, there is no entrance export to KML, but I believe, it will be added soon. Best regards, S. On 9 September 2012 11:23, John Stevens <john@k-stevens.co.uk> wrote:

I have been trying to create a model of an area on Montenegro. This area uses a local map system VGI which I thought was EPSG:3908

origin 18 degrees E scale 0.9999 false easting +6500000 false northing 0.0

Dx +653 Dy –212 Dz +431 Da +740 Df –0.00010441

When I use these in a gps (user grid etc) they produce the correct VGI coordinate to match the maps.

I successfully produce a kml file but all the caves are about 400 east of where they should be.

Is EPSG:3908 useable in Therion?

A second little point, that I may have seen somewhere and now lost. How do you mark an entrance to show up as a point on a kml file I have used this for the lox output fix 1.0 6559346 4713067 766 # comment station 1.0 "GK103_SS" entrance

John

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