With all of the compatibility issues with phones/tablets posted on these forums, I wonder if the folks at DJI have ever considered producing their own dedicated graphics device solely for use with their drones. It could be sold as an add for folks that either do not own a smartphone or would rather not use their own phone/tablet. It would solve the compatibility issues since they would control the design and the programming. They could leave the software open source for apps like Litchi. Or perhaps, some third party could produce such a device but I don't know what issues would be involved with that. Just a thought.
johnf
johnf