Thank you for mentioning that. I am aware of the feature to use iOS device as the tracking device, I was asking about an external GPS device, external to the IOS device as well as the remote control that is. Such external device would be connected to iOS device via bluetooth, and the GPS signal from such an external device be used as the GPS signal for autopilot modes such as follow me. Examples of such external GPS device could be a Garmin wearable watch. In the use case that I described where a water skier is towed behind a boat, I would not want the skier to have any iOS device, but instead a waterproof GPS wearable. I hope that makes sense.