Hi I’ve had a similar problem and followed the above advice but unfortunately when i come to digitise the river string RAS mapper just hangs on me and freezes.
I’ve tried loading an example dem from the tutorials and don’t have a problem.
When I expand the geom tree for the river i can add flow lines etc but as soon as I try to add the river string it freezes. I can also add x sections without a problem.
I’ve set the projection and the dem is 12,000kb so not sure what I’m doing wrong.
Can anyone offer some advice please?
Regards
Paul