[GPSNavX]

Only a simple question : a friend gave me some BSB Maptech maps with HDR suffix, but I could not open them, why ? is there a software to convert this kind of map ?

You some what answered your own question. Maptech decided in order to stop the rampant sharing of charts they would come up with a new format for their charts that requires registration so charts could not be shared. This is the BSB format.

The good news is that Maptech will let users upgrade their old PCX (HDR) charts for a very reasonable price. Contact them and tell them your situation.