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Sure, because it's fast and easy. But I bet you any pilot can work it out with pen and paper if they have to. They get tested on that stuff, at least where I live.

Same with a boat. All you have is what you bring. Will the Ipad survive weeks of salty spray? Maybe, but a backup (pen and paper) is recommended

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That depends on how you were trained. Many ground schools are now recommending students to use a CX-3 (flight computer) instead of slide rules.

> use a CX-3

Now you're making me sad that we just trashed a box of prototype CX-3s!

What’s the story behind this?

The initial version of the CX-3 was developed here. (The final shipping version, not so much.) This was before my time so all I've really done is clean up the aftermath.

Any prototypes left ;) ?

Nope. I don't think they worked anyway. (Whether they could have ever worked also seemed to have been an open question. Something about the keyboard was a lot of trouble. I think the early prototypes were a lot thinner. Possibly unmanufacturably thinner.)

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