Wot others say:
- NATS EasyVFR Basic: free and will keep you out of where you shouldn't be. Works on Android, think it works on ipad
- Skydemon for planning and navigation. Costs, but superb. Android, ipad and PC (so you can plan at home and then load plans on a tablet)
If you have any issue with the ipad, my suggestion would be to get a cheap Android tablet for the plane. Don't need bells and whistles, just a functioning GPS. Doesn't need phone connection, you can load plans (or Easy VFR data) over wifi before you start. Plenty for £100-150 UK prices.
I also run Skydemon on my Android phone for short trips and as a backup.