That particular piece of kit says it's also a receiver, but the AT&T 3G/4G/LTE iPads all have a built in GPS receiver. An external antenna to enhance reception is a common accessory, but not required if the iPad has a clear look at the sky. I use mine in GA flying all the time with no external antenna. Oh, and it's got a FAR better EFB than that Jepp POS.

Looks like Chuck'll have to get the FOM rewritten, or we can't turn these on.