Should both *.hnr and *.fbl files be in the iGO/content/map folder of iGO Primo and if so, how does iGO Primo select one or another ?

I know the hnr files go in the map folder, as go the fbl. The fbl are the maps. The hnr are (as far as i know) smart routing files. Smart routing being the best route, given the day and time (working day, rush hour, ...)
I think you should use them together.
The reason why I am not sure is because I stopped testing Primo, waiting for a data.zip that really works on my device.

Nabi You are right. It goes in the same folder. I am using primo and with the hnr files the calculating time is much quicker.

HNR= Preprocessed Road Network

"hnr files are with the defined routes (quick, short, economical, easy) - should be included in the folder \ primo \ content \ map ( where the map is). With these files Primo after the choosing of destination point is not converted the entire route, but uses the defined routes in these files, which greatly accelerates the process of converting .. The files are not compatible with iGO 8.3.x and Primo can only use them."