text: Whoa!  This is an old note.  Using OSMAnd, I just did a route plan from  much north of Mather Pass, all the way south to where the King River crosses the JMT.  the elevation plot and calculated is all accurate and no issues show now.  I think the topo layers, for OSMAnd at least, have been update within the last year or 2.  if the issue was in the providers there, they don't exist now.  I feel confident closing this note now.