@lennyo It's too much of a diversion to address in this thread, but HERE is HERE. Their maps traditionally have issues with timeliness of updates, accurate road closure information, and even accurately placing roads where they actually should be. It's a simple reality that the MRA developers have to deal with, and that they are forced to deflect from in the various forums.
I mostly use MRA Routeplanner to create routes for GPX export into my Garmin devices. I've given up using HERE as the base map (for the above reasons) and use OSM instead. I've created dozens of critical routes used OSM as the base, and they import correctly into Garmin devices without issue. I'm comfortable that OSM a 100% GPX export solution, and I don't hesitate to use it.
Unfortunately, using NN requires development on the HERE map. It's one of life's inconveniences you'll have to work around. There are many creative (but awkward) solutions that have been presented in the forums for moving forward in most scenarios.