One thing to be aware of is that the WiFi only iPad does NOT have an internal GPS, so it becomes necessary to use an external GPS source such as Bad Elf. If you want an iPad with an internal GPS you should choose the 4G model but you do NOT need a SIM card in order to be able to use the internal GPS, contrary to what some retailers will tell you. However, with a SIM card, you will have the convenience of being able to update NOTAM and weather in the absence of WiFi assuming, of course, that you have a 4G signal.

A‌s far as internal storage is concerned, my philosophy is to get as much as you can afford. You can never have too much internal storage in my opinion!‌

Mike
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Regarding the memory size needed, here is the slide I use during my tablet presentation. Sorry, it's in french. It displays the size of some GA aviation applications on my iPad. Skydemon for a french user needs only 1.8 Gb including all visual approach charts.





Vincent B.
(St-Cyr/LFPZ, Toussus/LFPN, San Diego/KMYF)
Check my blog : http://20-100-video.blogspot.com

Hello again,
thank you all for your comments!‌
As I don't have a big clue‌ of all these different iPads or alternatives over the years I assume that - 2 be on the safe side - I will have to buy a new Wi-Fi & Cellular iPad (so with internal GPS - no 2nd device needed, what I don't want - and iOS, to have no update-problems) and 128 GB + a SIM-card to be able to update NOTAM and weather at least on the ground before departure. That's the full option solution ;-). The iPad 128 GB costs me - here in Germany - around 659 Euros plus SIM-card. But that should do it then in any case, I hope. The price difference between 32 and 128 GB is around 100 Euros, so that also doesn't matter then any more. So I give up thinking and looking forward to use state of the art Apple-equipment in a small clockwork aircraft from the early middle-age (PA 28 w/ ADF/ VOR/ no DME)...

I think that figure for SkyDemon above is wrong. SkyDemon's France chart is about 15mb or less, so you'd be talking about a few hundred megs even with every French VAC downloaded.

Vincent B.
(St-Cyr/LFPZ, Toussus/LFPN, San Diego/KMYF)
Check my blog : http://20-100-video.blogspot.com

I have been using my Galaxy Tab S2 for 2 years and it works flawlessly. there is a newer version now but if you want the S2 you can get it for 300EUR. I am not a fan of Apple products. With the S2 you don't have to worry about GPS, memory is expandable, there is a version that supports cellular and it only costs half as much as an iPad.

About the size taken by Skydemon on my iPad. I had Switzerland & UK installed. I have also some PDF document. Even after unselected the CH and UK country, "Document & Data" from the storage info on my iPad still display 1.86Gb. No big deal on my iPad, but size is un-explained so far.

Vincent B.
(St-Cyr/LFPZ, Toussus/LFPN, San Diego/KMYF)
Check my blog : http://20-100-video.blogspot.com

Documents like AIPs don't get uninstalled when you untick charts. I would say with that size, you have at some point downloaded many entire AIPs to your device.