As it may be interesting to others, here are the relevant infos from your pm and my reply:
.... I went through the entire thread you pointed out and it was very fruitful indeed.
Well one particular reply caught my attention: #116

The guy states he downloaded, burned and installed the nav disc on his AVN6000. The AVN series are related to Eclipse by Fujitsu Siemens which is basically an older version of my unit (AVN6600).

Other replies are related to Toyota and Subaru Nav discs (Whereis).

Since my AVN unit was purchased from the US with American mapping software, I only have to find a Whereis software for the Middle Eastern market and it will work in my unit. Well this is the closest I will get to having a working navigation system in my car.
Thanks for the info that the AVN's are related to Fujitsu Siemens. The problem maybe though is that your AVN6600 uses different fw and/or files structure to the AVN600, similar to the differences in Denso C1 & C2 units ...... Definitely you should try it, if you can find a compatible map disc for your country. Sensis/Whereis is part of Telsta Aust and i'm not sure how many other countries their map data is available for, but any fw on the (oem/update) disc would be proprietary to the unit manufacturer i would think, ie Denso, Siemens etc. If a Toyota C1 Denso disc works in a similar unit to yours here in AU then maybe you could try a local Toyota disc? Again, good luck and let us know how you get on ........