I would also like to know but I don't care about GPS at the moment.
from another site***if your bootloader is 05.08 then you can download fuzzyband from cydia and this will bring your baseband back down to whatever it was,if you have a bootloader 05.09 then your stuck with the 6.15 baseband untill there is a fix,good luck. Apple, iPhone and iPad Forums | ModMyi.com
