No, the override does not work with 7.1. I was going to try and burn hybrid 4.1/7.1 and 5.1/7.1 disks and try both.
Will keep you posted.
You are confusing two different things. 7.1, 6.1, 5.1 etc. are map versions and not hardware versions of the Navigation system. Which system you have depends upon the year model. Current 08 models are using generation 5.5 or 5. A generation 4 nav system can be overridden but a gen 5 or newer can not. A gen 3 did not have the override but a gen 2 system would override if you went to the overview screen and pulled the data up 3 times.