OSGB36 and EPSG conversions need a latitude/longitude terrain origin. Load terrain through a source that sets one, such as LTLoadGeoElevationLL, or use the Local grid option, which never needs one.
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Check any national grid conversion against known control values before relying on it for real setting-out.
Examples
(1)
Basic Examples
(1)
Convert a point on the Isle of Wight to British National Grid:
In[1]:=
LTConvertToGrid
[50.65`,-1.25`,"OSGB36"]
Out[1]=
{453120.,83636.8}
Convert the same point to Spain's UTM zone 31N by EPSG code: