Add contours to aerial photos
Contours could be calculated (easily) by TNP as SHP from existing (or future updated higher res.) DEM (MTH) files and made available (perhaps by quad or 1/4-quad) as overlays that can be added to a Project and displayed and printed on aerials, with all the flexibility of overlay display. (Alternatively, the contours might be calculated dynamically.)
This is a new feature of TNP 11, released 12/1/2016.
Bill May commented
See Bill Neve's closely related suggestion "Would be very useful to be able to overlay…"