However I think I'm just overloading the ipads cache. A reset fixes it(it's happened twice to me). I was thinking the tracking function on Bluechart may be overloading the memory? Do you use a similar function on Navionics?

I'll send an email to a tech guru on this and see if he has a solution.

I asked a good friend that runs Navionics on his Ipad mini. He's going down the ditch right now and said he has no problems at all. He is using the Ipad mini as his main onboard chart plotter with a few iphone etc. back ups.

This makes me thing for us(different chartware), it must be a function of the GLO?