>I'm trying to identify specific points on the centerline of a river channel
>by "river mile" , that is, points along a path at specified distances from
>a starting point  — not at regular intervals. Any suggestions how I might
>go about this?

have a look at 

https://grass.osgeo.org/grass82/manuals/addons/v.fixed.segmentpoints.html

for inspiration to create an input file for v.segment.

kind regards
Helmut

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