> I cannot get preview/offsets to work for projected elevations, should

they, the thbooks seems to say any map!!

So yes, I checked a projected elevation.

Both offset and preview work OK, just like plan projections.

The difficulty I recalled may have been associated with ‘map-level’.

In the diagram below, the shaded passage is ‘preview below’, and the outline is ‘offset 100m above’.

The definition is like this…

map AblutionInceptionElev020Map \

  -title "Greenlink System Elevation looking 020 deg" \

  -projection [elevation 020 deg]

   #in front

   JM-DigiPlusElev020@MiddleEarth [000 100 m] above

   IK-LuckyCowboyElev020@MiddleEarth [000 100 m] above

   break

   JG-TrainElev020@MiddleEarth

   …

   break

   preview below IJ-CarpeDiemElev020@MiddleEarth 

   …

endmap

and in the th-config the map is invoked directly with

   select AblutionInceptionElev020Map

Hope that helps

Bruce