With Here, you can download maps to use offline. 

And, via personal experimentation, I can attest to the rapidity with which the screen will update (even in “airplane mode”) on my iPhone when in a commercial jet if I have Here open. 

So why don’t they advertise their mapping product(s) to pilots?

Or do they, and I just haven’t noticed?

I’d think running Here on an iPad Pro or even an iPhone 6S Plus would be fantastic for pilots of all stripes – private, charter, military, and commercial.

I’m sure other devices will handle Here well, too – but have only tried on my iPhone & my dad’s Samsung Note.