CYA Aviation Calculator, Micro E6B Metal Flight Computer, 7.4 x 4 Inch, Aluminum, Aviation Calculator

This appears to be a replica US Air Force vintage mechanical navigation computer MB-4A, which can be purchased brand new from the manufacturer. It includes advanced features such as a grid on the wind slide, and a latitude scale on the calculator side. This is the example computer used in the out of print FAA Flight Navigator Handbook, and these features allow for advanced techniques such as navigation using changing pressure patterns, plotting courses using multiple winds, plotting intercepts of moving targets such as ships or aircraft, and making some corrections for navigation by the stars. None of these are currently required for modern civilian flight training, but can be appreciated for their historical importance. It's a charm to have one of these as a brand new version. The MB-4A markings on the protective sleeve are a nice touch.

Smaller than expected. Recommend getting the large to make it easier to read

It’s a bit small and the letters are a little hard to read. I think this is good if you’re using it for your written but wouldn’t recommend for in flight use. It’s too small.