Ipad
If you're going to use an iPad for Skydemon, make sure you buy the cellular model (3G/4G) because the normal wireless models don't have the GPS chip built in so you will have to buy a external GPS unit (bluetooth or plugin direct to the iPad) to be able to use Skydemon. I find this a pain for a few reasons 1) if it's a Bluetooth GPS unit then it's just another thing you need to make sure is charged 2) it's more clutter. 3) If you buy the GPS unit that plugs directly into the bottom of the iPad it gets in the way and can easily be bumped and damage the connector (as mentioned by a previous poster) It's actually also really handy to have the cellular model because you can buy a £5 month data only sim card and pop it in there and you will have instant TAF/METAR and NOTAM updates and you can also access your routes from the cloud without having to be on the wireless. This has proved immensely useful for me. I'm using the Ipad mini 4 and it's the perfect size for the cockpit.