I have always been really confused on what kind of GPS is inside the iPad. I keep hearing different stories like: only the 3G has a GPS chip, the GPS chips only work when you have access to 3G or cell coverage, the Wi-Fi iPad has a legit GPS chip, etc. I can't figure out what's what. Apple's website says both models have assisted GPS, does that mean they dont have an independent GPS chip that can provide navigation when away from 3G or cell coverage??? I am mainly look at the iPad for aviation uses. I would love to get a WiFi iPad as an aviation GPS. What would be even better is if the iPad could use an external bluetooth WAAS enabled GPS receiver, but I hear Apple programmed the iPad so that it can only transmit audio over bluetooth. Can someone clarify these things? Also, when is the iPad expected to be updated? Thanks! EDIT: What is this Skyhook Wireless thing that Apple has cooked up with the WiFi iPad?