Does having WiFi on improve GPS location services even when not connected to it?

I know it'd use more battery juice but it'd be worth it to me if it helps. I've tried different setting combinations and can't tell for sure which ones were best. I use a walk/run app that gives you a "breadcrumb" trail overlay on a google map. It's fairly accurate but sometimes it has me walking through buildings and shows other inconstancies. So anyway, does anyone know if leaving WiFi on when only connected to 3G improve the GPS lock?
Thanks

Thanks for the responses. Reading the article you linked, modular747, confirmed what I was thinking might be true. I often read how accurate the iPhones GPS is but I have no frame of reference, it's the only GPS device I've ever used. Does everyone have it wander around a bit or is it always "dead on"? I have a 4S and have read it uses the Russian GLOSNOSS satellite system as well as the USA's GPS. But still, it wanders. This is normal? I'd like to make sure I've not got a defect in it. I especially notice it when using the tracking apps (Walkmeter and Nike Plus) I described above.

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