New to Bookmark+: Bookmarks for reading

[Tory S. Anderson]

I'm making the transition from vanilla bookmarks to bookmark+ and am realizing 
that BM+ has a completely different level of usage. I look forward to learning 
it, but for now I'm struggling with the basics. In particular, since I use 
bookmarks for actual reading, how do I update the bookmark of the current 
buffer to my new location (within the buffer)? That used to be the default with 
`C-x r m`, but now that things like tags and information are involved, I'm 
worried about wiping all of that out every time I "replace" a bookmark. 

Searchign through the bkmp lists doesn't reveal anything for updating. How do I 
simply (and easily) update the file location the bookmark points to?