There are few complaints mushrooming up mentioning that the GPS is not working since after upgrading to baseband 06.15.00 with iPhone 3Gs and 3G. In fact, this situation is resulting into two issues. One is battery drain off and other is GPS not working. We have already posted you a lot more information about arresting the battery drain off issue. Now, the GPS problem is still under study and resolution stage from the iPhone Dev Team.
In fact, experts in this field such as Muscle Nerd felt that the GPS issue is not due to baseband 06.15.00, but still the reasons are unavailable for this issue. Also, Muscle Nerd confirmed working on the fix for this issue and intimates the same soon.
@ThePuaSwitch : We are working on a fix for those who see the problem ( it is not ethe limitation of 06.16, we know that much).
We will keep on track about the fix from the experts and keep you posted immediately once after it is available.