Quoting Bruce Mutton <bruce.mutton@paradise.net.nz>:
I notice I had to add an 'extend left' to the centreline data to stop the passage plotting upside down and sort of inside out. (although interior of passage was correctly rendered) I assume that this approach is the correct way to address this issue??
Yes.
The trouble is, this always plots as though it is extended (dashed horizontal grid, no vertical grids) but with an obvious projection (of 000 deg- assuming 0 deg means looking towards the north(?)) that does not change regardless of the bearing provided in the export command. In other words it's partially working. For example the code I used is below.
I am not sure, I understand 100% what you are asking for, but I will try. In the elevation projection, the facing angle parameter is part of projection definition. So if you would like to have projected elevation scrap drawn when you are facing West (270 deg), you need to specify this not only in export command, but also in scraps. Example: scrap xxx -proj [elevation 270] If only elevation is used, than 0 direction is assumed. This is probably the source of your problems. If I am wrong, please let me know. Regards, S.