DJI makes 3 different
goggles that I am aware of,
DJI Goggles,
DJI Goggles RE, and the DJI Digital FPV system. As I understand it you can control/access your DJI drone (Mavic, Mini, etc) with the
Goggles and the
Goggles RE and you will receive the drones video feed in the
goggles. (This will be similar to the view that you would normally see on your phone, but in the
goggles.) The "DJI Digital FPV system" is a different animal and has to be used with a separate camera/transmitter that is attached to the drone. The
DJI Goggles will only work with DJI products and the
DJI Goggles RE will work with DJI products AND analog FPV racing drones (however, their are many analog alternatives that offer better range than the
Goggles RE). The DJI Digital FPV system is an extremely well rated
FPV goggle, but it will not work with DJI drones without significant warranty voiding modifications.
What I am concerned with is your friend wants to fly "FPV" with a Mavic. I own a Mavic Pro and several "FPV" drones and they are COMPLETELY different in their approach and features. When you say "FPV flying" to me I think low latency visual stunt or racing flying with high speed flips, rolls, proximity flying and frequent crashes. (Search YouTube for "Rotor Riot", "LeDrib", "Mr. Steele", and you will see intense FPV flying.) To my knowledge DJI does not make an FPV racing drone, and their Mavic/Phantom series are NOT even close to to a racing/freestyle drone. My beloved Mavic Pro is an unbelievably solid and stable photography platform that is fantastic at what it does, but compared to my FPV drones it is impossible to roll or flip, it is slow even in Sport Mode, it has significant video lag, and, I go out of my way NOT to crash it. With my FPV drones I bounce them off the ground or obstacles at high speeds on AT LEAST 50% of my flights. Hitting a flagpole with you
Mavic Pro 2 at full speed will make you VERY sad, hitting one with your FPV drone is just another day of flying.
If your friend just wants to see what the Mavic or other DJI drone sees in his
goggles instead of on his phone/iPad, have him get the
Goggles or the
Goggles RE, but, it won't be what many consider "FPV" flying. (Folks really enjoy this, but if he wants to dive buildings and do "juicy flips" he will not be able to do that with a DJI drone.)
I would confirm what your friend means when he says he wants to "fly FPV with all DJI kit".
In addition, I must note that I don't own or use any
DJI goggles, so before he makes a purchase I would have him talk to directly to DJI. (I use Fatshark HDO's with a RapidFire diversity receiver for FPV flying, and I have never flown my Mavic with any type of
goggles.)
I hope that this hasn't confused you even more!
Peter T