Just bought the CX-3 after using the E6B for months learning on it, and my calculations have become ridiculously faster. I love the thing, just wondering if anyone knows if you can calculate true altitude on it through a function or do you just have to use a calculator and the rule of thumb method? Anyone could help that'd be great!

There is no way. I was trying to figure that out a while ago. Could only do it with the old wiz wheel. Had to take the wheel with the CX-3 for my exam, in case I got a true altitude question - which I didn't.

Skymark's right. I had the same issue and decided to contact asa about this. Here's the reply I got;

I cant believe there is no function for it in CX-3... !