I have an old iPad 3 64gb but was thinking that a newer model may work better especially as software updates and the speed of processor will be better for screen rendering etc
Your iPad is too old to run DJI GO 4. You'll need to use one of the Apple devices from
this list.
which iPad (mini or full size?)
This is really a personal preference. If you've never seen both in person, then you should go to a store that sells them and check them out. The bonus of going with an iPad
Mini 2/3/4 is that it'll fit in the remote controller arms
(assuming you don't mind having a tablet wedged between your arms as you're flying).
If you decide to go with a full size iPad, you'll need a tablet mount to mount it on the remote controller. Here are some commonly used tablet mounts:
which model (wifi or cellular?)
Cellular models contain a GPS receiver. With a GPS receiver on your mobile device, you'll be able to use the Follow Me flight mode and/or be able to manually reset the home point to your current location after taking off
(which could be helpful if you move away from the original home point). The GPS receiver will be active even if you decide not to activate the cellular service. With the cellular service activated, you could do things that require an Internet connection -- like downloading the DJI GO maps in real-time
(instead of caching them before you go out to fly like this).
If you decide to get a Wi-Fi only device and need to add GPS later, you could connect a Bluetooth GPS receiver to your tablet whenever you need to use GPS. Here are some commonly used Bluetooth GPS receivers:
- Bad Elf (connects to GPS satellites)
- Dual (connects to GPS & GLONASS satellites)
- Dual (connects to GPS satellites)
- Garmin (connects to GPS & GLONASS satellites)
which size memory (16/32/64/128?) would be sufficient and most use?
16 GB would be plenty of space if you're only going to use the tablet to fly your Mavic. If you're planning on using it for other things and/or know you'll install other apps that require a lot of storage, it would be better to get a tablet that has more memory.
I'm not sure if the iPad uses memory to record data whilst in flight or is that stored onboard the MP?
Full quality photos/videos are always stored on the removable memory card in the Mavic. With the "Cache During Video Shooting" setting enabled in DJI GO
(see the screenshot below), you can also store a low quality version of the video on your tablet. That might come in handy in a scenario where you lose your Mavic and need a copy of the video as proof of the flight. It's a lower quality video, so it's probably not something you'd ever want to post on YouTube or share elsewhere.
TXT flight logs will also be stored on your mobile device. DAT flight logs are stored on the non-removable memory card inside of the Mavic. If you ever lose your Mavic, the TXT flight logs will come in handy since you won't be able to access the DAT flight logs.