Jvimg.ttd can we delete it from NAV2 devices?

From a NAV3-map you can delete these files (if present):

- all files "adpoints_*.dat"
- all files "arp_*_2000_10_10_f.dat" - present in Mazda-NB1-maps (nav3-fuji)
- all country-subfolders - present in Mazda-NB1-maps (nav3-fuji)
- the file "asrgrammarinfo.xml" - present in Mazda-NB1-maps (nav3-fuji)
- all files *.png - present in NAV3-maps like Egypt, Indian_Ocean or Tunisia

If your NC has the folder "zip" with the current files for Singapore, Nederland and Grat_Britain (you can get them with TTActivator), you can also delete the files "postal_*.ttd" from NAV3-maps that contain one of these 3 countries.