Still, my printed paper route maps have a 100% chance of working every time.
The first thing any purchaser of an Ipad does is buy a protective screen and case for it. Then they buy a suitable clip/mount for it.
I buy a packet of 100 plastic sleeves from Officeworks for $5 and use just one of them for my printed paper route maps which I can then fold, drop, scratch, use as a meal tray and slop coffee on to my heart's content.
Neither Avplan or Ozrunways will work on a PC, let alone one that is 20 years old. The first thing Ozrunways warns you is that they do not support older Ipads.
My aviation grade Lowrance AirMap 500 GPS is still working well 15 years on. The printer and PC I use are 10 years old. Any consumer grade Ipad/tablet will just about be dead after 5 years.