The MH-TT3 is a navigation package variant containing TomTom map data designed for camping, motorhomes and caravans.
The PC-NNG3 is a classic car navigation package version with NNG map data content.
Both variants offer 3 years of map updates.
Z-EMAP76 packages are only intended for the newer device models, while older devices require the Z-EMAP66 navigation packages (see device compatibility)
For further details, please refer to the product information of the respective package.