What "Enable Advanced Network Functionality" does is turn on (or off) RNDIS support. This turns the phone into a network router which enables the BT PAN (networking protocol) to work when you pair the GPS to the phone. Whether the connection using RNDIS is USB or BT doesn't matter as for as the router founction is concerned.
When RNDIS is turned off (box unchecked) then the usb connection is established via a virtual com port. Some BT GPS recievers allow connection via a virtual com port also if you establish the port when you initialize the software. However, serial links are much slower than network links, so you always get people saying "it works when I turn off ANF but the connection is slow as molasses". Indeed it is. |