Thread: About gmapdem.img file Express updated in Nuvi with 2015.10 EU release.

Originally Posted by Grumpier

Unfortunately mapupdater isn't much better doesn't fare much better and I base this statement on the fact that the 2014.40 update was done through this software and was the start of the DEM map issue.

I've never heard about problems with DEM map with 2014.40 update with Mapupdater.
Problem arose with GE wiping DEM map updating 2015.10 CNA and probably updating any CN with that particular GE v.3.2.4.0 . It was a GE bug now fixed with GE new version, like said in the linked above Garmin forum thread.