GPS for 5D3

AndrewG wrote:

The iPhone unquestionably has real GPS (since the iPhone 3G four years ago) — in fact, in certain ways its GPS is quite a bit better than “normal” GPS, because it can use Wi-Fi signals to achieve position lock much faster than with GPS alone. However, like almost all non-dedicated GPS units, its antenna is very small, and so it won’t get lock in many cases where a dedicated, standalone GPS unit would.