I use TZ Navigator 3.3 with NN3D and TZT14. I've been offered the upgrade to Navigator 4.0 but have now been told that 4.0 isn't fully functional with NN3D or TZT. Specifically, it will no longer be possible to sync routes and marks between the Navigator software and the NN3D and/or TZT network environments. I guess I understand with NN3D as it is older... but is this signalling that TZT is now also at the end of its product development life ?