Allow measurement tool to do 2 X measurements from 2 VOR's

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Please allow measurement tool to be used in a persistent manner for cross track checking with analog instruments and the chart from 2 VOR’s or Vortac/DME. The tool goes and won’t persist (or maybe I just don’t know how to use it properly). It would help find where one is without the live chart - I (and others I suppose) would like to learn these piloting skills but now it is hard to find instruction on how to do this with all the glass cockpits and very few totally analog aircraft.