New Iphone 4 Jailbreak help

[acpowman]

Just got a new replacement iphone 4, it's 4.2.1 with 03.10.01 baseband.
I'm wanting to get an untethered JB for it but want to make sure the GPS will continue to work, my 3gs JB disabled this function.
Should i upgrade to 4.3 and wait for the soon to be released JB, or JB on 4.2.1 now ?
Does the current untethered JB for 4.2.1 allow the GPS to still function ?
Thanks for your help

 

[forcetactic]

Yea jb 4.2.1 with greenpois0n

 

[acpowman]

Ok thanks, what's the advantage/differences between greenpoison and pwnage tool ?