Features are saved in region 140. There is a list of 00 or 01 on the beginning of region, where 01 means active feature.

offset - feature
09 - 3D buildings
0A - 3D Terrain
0C - TTS Phonetics
0C - Junction View
0D - Line Assist
0E - Speed limit
0F - Traffic Eula
10 - Photo Nav
11 - ASR
12 - Historic Traffic
13 - Custom Avoidances
14 - Advanced Detours
15 - Premium Points Addresing
16 - 2D Footprints
17 - Custom Main Menu
18 - 3D Buildings Supplementary
19 - Bluetooth ??
1A - Bluetooth ??